Californian Michael Schwabe said goodbye to the gas pump two years ago．He leased an electric car．Schwabe says he gets more out of driving an electric car than just a charge."With the price of gasoline and with the problems with clean air,it's important we get electric vehicles out on the road."On California roads there are about two thousand electric cars．By 2003,ten percent of all new cars may be required to have zero emissions．This is a mandate automakers say it is way ahead of its time.Gloria Bergquist of the Alliance of Auto Manufacturers says,"The technology(for zero emissions)isn't here yet;it still needs advancement in driving range to make it more appealing to a wider consumer audience."Auto makers blame it on the batteries．Power runs out on most cars after about 70 miles．However,some cars can now go more than 100 miles on a charge．Batteries are expensive．Carmakers say there is nothing they can do about it.Tim Carmichael of the Clean Air Coalition says,"The automakers have not built a vehicle unless required to do so,so it's very important for the state to stay committed to this program requiting automakers to build small amounts in beginning years and then the market will take off."Right now the California Air Resources Board requires that a percentage of new cars sold should be free of emissions．What is that percentage?A.1%．B.5%．C.10%．D.100%.
Californian Michael Schwabe said goodbye to the gas pump two years ago．He leased an electric car．Schwabe says he gets more out of driving an electric car than just a charge.
"With the price of gasoline and with the problems with clean air,it's important we get electric vehicles out on the road."
On California roads there are about two thousand electric cars．By 2003,ten percent of all new cars may be required to have zero emissions．This is a mandate automakers say it is way ahead of its time.
Gloria Bergquist of the Alliance of Auto Manufacturers says,"The technology(for zero emissions)isn't here yet;it still needs advancement in driving range to make it more appealing to a wider consumer audience."
Auto makers blame it on the batteries．Power runs out on most cars after about 70 miles．However,some cars can now go more than 100 miles on a charge．Batteries are expensive．Carmakers say there is nothing they can do about it.
Tim Carmichael of the Clean Air Coalition says,"The automakers have not built a vehicle unless required to do so,so it's very important for the state to stay committed to this program requiting automakers to build small amounts in beginning years and then the market will take off."
Right now the California Air Resources Board requires that a percentage of new cars sold should be free of emissions．What is that percentage?
"With the price of gasoline and with the problems with clean air,it's important we get electric vehicles out on the road."
On California roads there are about two thousand electric cars．By 2003,ten percent of all new cars may be required to have zero emissions．This is a mandate automakers say it is way ahead of its time.
Gloria Bergquist of the Alliance of Auto Manufacturers says,"The technology(for zero emissions)isn't here yet;it still needs advancement in driving range to make it more appealing to a wider consumer audience."
Auto makers blame it on the batteries．Power runs out on most cars after about 70 miles．However,some cars can now go more than 100 miles on a charge．Batteries are expensive．Carmakers say there is nothing they can do about it.
Tim Carmichael of the Clean Air Coalition says,"The automakers have not built a vehicle unless required to do so,so it's very important for the state to stay committed to this program requiting automakers to build small amounts in beginning years and then the market will take off."
Right now the California Air Resources Board requires that a percentage of new cars sold should be free of emissions．What is that percentage?
A.1%．
B.5%．
C.10%．
D.100%.
B.5%．
C.10%．
D.100%.
参考解析
解析：参见第三段：加利福尼亚州要求到2003年，加州的道路上应有l0%的新车是不排放污染气体的。
相关考题：
Passage FourOne evening Mr. Green was driving home along a lonely country road. He had ￡ 100.00 in his pock et. At the loneliest part of the road, a man asked for a lift (搭车). Mr. Green told him to get into the car and continued his driving. When he talked to the man and learned that the man had been in prison for robbery and had broken out of prison two days before, Mr. Green was very worried.Suddenly he saw a police-car and had a bright idea. He just reached a small town where the speed limit (限制速度) was 30 miles an hour. But he drove the car as fast as it could go. He looked back and saw that the police-car had begun to chase (追) him. After a mile or so the police-car overtook (赶上) him and ordered him to stop. A policeman got out and came to Mr. Green's car. Mr. Green hoped that he could tell the policeman about the escaped robber, but he felt the man had put a gun against his back. The policeman took out his notebook and pencil, saying he wanted Mr. Green's name and address. Mr. Green asked to be taken to the police station, but the policeman said, "No, you will have to appear at the police station later." Mr. Green had to do as the policeman told him. The policeman wrote his name and address down, put his notebook and pencil back in his pocket and gave Mr. Green a talk about dangerous driving. Then Mr. Green started up his car again and drove on.Just as he reached the outskirts (郊区) of London, the passenger said, "! want to get off here." Mr. Green stopped the car, the man got out and said, "Thanks for the lift. You've been good to me. This is the least I can do in return (报答)." And he handed Mr. Green the policeman's notebook, which he stole while the policeman was talking to Mr. Green.46. The man asking for a lift was ______.A. a robber who robs driversB. a policeman who had worked in prisonC. a prisoner who had escaped from prisonD. a stranger with ￡ 100.00 in his pocket
In order to cut down on the carbon emission, more people choose to travel＿．A．by electric car, bicycle or planeB．by private car, bicycle or busC．by bus, electric car or planeD．by bicycle, bus or electric car
For many years, people electric cars. However, making them has been more difficult than predicted.A．had dreamed ofB．have dreamed ofC．dreamed ofD．dream of
Having been working in logistics for 3 years, he is more()than he used to be.A、 proudB、 braveC、 confident
In order to cut down on the carbon emission，more people choose to travel______.A．by electric car，bicycle or planeB．by private car，bicycle or busC．by bus，electric car or planeD．by bicycle. bus or electric car
If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably ______.A.excessive pump speedB.excessive suction headC.worn wearing ringsD.gross pump misalignment
共用题干Some Sleep Drugs Do More Than Make You SleepThe United States Food and Drug Administration(FDA)has ordered companies to place strong new warnings on thirteen drugs that treat sleep disorders.It also ordered the makers of the sleeping pills to provide information for patients explaining how to safely use the drugs.Last Wednesday,the FDA announced that some of these drugs can have unexpected and dangerouseffects.These include the risk of life-threatening allergic（过敏性的）reactions.They also include rareincidents of strange behavior.These include people cooking food,eating and even driving while asleep.The patients later had no memory of doing these activities while asleep.Last year,a member of the United States Congress said he had a sleep-driving incident.PatrickKennedy , a representative from Rhode Island,crashed his car into a security barrier near the building wherelawmakers meet.The accident happened in the middle of the night and no one was hurt.Mr.Kennedy saidhe had earlier taken a sleep medicine.He said he was also being treated with a stomach sickness drug thatcan cause sleepiness.The FDA did not say in its announcement how many cases of sleep-driving it has documented.However,the New York Times reported last year about people who said they had strange sleep events after taking the drug Ambien.Some reported sleep-driving and sleep-walking.Others said they found evidence after waking in the morning that they had cooked food or eaten in their sleep.But they had no memory of carrying out the activities.An FDA official says that these serious side effects of sleep disorder drugs appear to be rare.But,he also said there are probably more cases than are reported.He said the agency believes the risk of such behaviors could be reduced if people take the drugs as directed and do not drink alcohol while taking the drugs.The FDA has advised drug companies to carry out studies to investigate the problem.After taking the drug Ambien,some people______.A:are unable to driveB:don't know how to cookC:suffer from eating problemsD:fall asleep while walking
共用题干Some Sleep Drugs Do More Than Make You SleepThe United States Food and Drug Administration(FDA)has ordered companies to place strong new warnings on thirteen drugs that treat sleep disorders.It also ordered the makers of the sleeping pills to provide information for patients explaining how to safely use the drugs.Last Wednesday,the FDA announced that some of these drugs can have unexpected and dangerouseffects.These include the risk of life-threatening allergic（过敏性的）reactions.They also include rareincidents of strange behavior.These include people cooking food,eating and even driving while asleep.The patients later had no memory of doing these activities while asleep.Last year,a member of the United States Congress said he had a sleep-driving incident.PatrickKennedy , a representative from Rhode Island,crashed his car into a security barrier near the building wherelawmakers meet.The accident happened in the middle of the night and no one was hurt.Mr.Kennedy saidhe had earlier taken a sleep medicine.He said he was also being treated with a stomach sickness drug thatcan cause sleepiness.The FDA did not say in its announcement how many cases of sleep-driving it has documented.However,the New York Times reported last year about people who said they had strange sleep events after taking the drug Ambien.Some reported sleep-driving and sleep-walking.Others said they found evidence after waking in the morning that they had cooked food or eaten in their sleep.But they had no memory of carrying out the activities.An FDA official says that these serious side effects of sleep disorder drugs appear to be rare.But,he also said there are probably more cases than are reported.He said the agency believes the risk of such behaviors could be reduced if people take the drugs as directed and do not drink alcohol while taking the drugs.The FDA has advised drug companies to carry out studies to investigate the problem.What happened to Patrick Kennedy last year?A:He crashed his car into a security barrier.B:He was killed during a car accident.C:His car broke down on the way home.D:He was treated for stomachache.
共用题干Some Sleep Drugs Do More Than Make You SleepThe United States Food and Drug Administration(FDA)has ordered companies to place strong new warnings on thirteen drugs that treat sleep disorders.It also ordered the makers of the sleeping pills to provide information for patients explaining how to safely use the drugs.Last Wednesday,the FDA announced that some of these drugs can have unexpected and dangerouseffects.These include the risk of life-threatening allergic（过敏性的）reactions.They also include rareincidents of strange behavior.These include people cooking food,eating and even driving while asleep.The patients later had no memory of doing these activities while asleep.Last year,a member of the United States Congress said he had a sleep-driving incident.PatrickKennedy , a representative from Rhode Island,crashed his car into a security barrier near the building wherelawmakers meet.The accident happened in the middle of the night and no one was hurt.Mr.Kennedy saidhe had earlier taken a sleep medicine.He said he was also being treated with a stomach sickness drug thatcan cause sleepiness.The FDA did not say in its announcement how many cases of sleep-driving it has documented.However,the New York Times reported last year about people who said they had strange sleep events after taking the drug Ambien.Some reported sleep-driving and sleep-walking.Others said they found evidence after waking in the morning that they had cooked food or eaten in their sleep.But they had no memory of carrying out the activities.An FDA official says that these serious side effects of sleep disorder drugs appear to be rare.But,he also said there are probably more cases than are reported.He said the agency believes the risk of such behaviors could be reduced if people take the drugs as directed and do not drink alcohol while taking the drugs.The FDA has advised drug companies to carry out studies to investigate the problem.The FDA warned that some sleeping pills______.A:can help people to learn to cookB:prevent people from driving while asleepC:present life-threatening risk to patientsD:have severe effect on a patient's long-term memory
共用题干Some Sleep Drugs Do More Than Make You SleepThe United States Food and Drug Administration(FDA)has ordered companies to place strong new warnings on thirteen drugs that treat sleep disorders.It also ordered the makers of the sleeping pills to provide information for patients explaining how to safely use the drugs.Last Wednesday,the FDA announced that some of these drugs can have unexpected and dangerouseffects.These include the risk of life-threatening allergic（过敏性的）reactions.They also include rareincidents of strange behavior.These include people cooking food,eating and even driving while asleep.The patients later had no memory of doing these activities while asleep.Last year,a member of the United States Congress said he had a sleep-driving incident.PatrickKennedy , a representative from Rhode Island,crashed his car into a security barrier near the building wherelawmakers meet.The accident happened in the middle of the night and no one was hurt.Mr.Kennedy saidhe had earlier taken a sleep medicine.He said he was also being treated with a stomach sickness drug thatcan cause sleepiness.The FDA did not say in its announcement how many cases of sleep-driving it has documented.However,the New York Times reported last year about people who said they had strange sleep events after taking the drug Ambien.Some reported sleep-driving and sleep-walking.Others said they found evidence after waking in the morning that they had cooked food or eaten in their sleep.But they had no memory of carrying out the activities.An FDA official says that these serious side effects of sleep disorder drugs appear to be rare.But,he also said there are probably more cases than are reported.He said the agency believes the risk of such behaviors could be reduced if people take the drugs as directed and do not drink alcohol while taking the drugs.The FDA has advised drug companies to carry out studies to investigate the problem.The risk of strange behaviors resulting from taking sleeping pills could be reduced if______.A:the FDA takes more strict regulationsB:drug companies listen to patients’adviceC:the New York Times releases more reports D:people don't drink alcohol whlie taking these pills
Californian Michael Schwabe said goodbye to the gas pump two years ago．He leased an electric car．Schwabe says he gets more out of driving an electric car than just a charge."With the price of gasoline and with the problems with clean air,it's important we get electric vehicles out on the road."On California roads there are about two thousand electric cars．By 2003,ten percent of all new cars may be required to have zero emissions．This is a mandate automakers say it is way ahead of its time.Gloria Bergquist of the Alliance of Auto Manufacturers says,"The technology(for zero emissions)isn't here yet;it still needs advancement in driving range to make it more appealing to a wider consumer audience."Auto makers blame it on the batteries．Power runs out on most cars after about 70 miles．However,some cars can now go more than 100 miles on a charge．Batteries are expensive．Carmakers say there is nothing they can do about it.Tim Carmichael of the Clean Air Coalition says,"The automakers have not built a vehicle unless required to do so,so it's very important for the state to stay committed to this program requiting automakers to build small amounts in beginning years and then the market will take off."What do automakers blame for there being few electric cars now on the road?A.The price of gaB.The mandatC.The conditions of the roadD.The batterie
As far back as he could remember,Larry had longed to go to Hollywood and become a film star．The young man's hopes for success were broken again and again,however．Hollywood just did not seem interested．When he first came to California Larry had decided never to give up and return home without success．Therefore,he kept on trying．Someday,he told himself,his big opportunity would come.Larry found a job parking cars for one of Hollywood's big restaurants．His pay was basic,but since the guests were kind enough to give him more money,he managed to make a living.One day he recognized an important film director driving into the parking lot and getting out of his car．Larry had recently heard that the man was ready to make a new picture.Larry got into the car and prepared to drive it on into the lot and park it．Then he stopped,jumped out,and ran over to the director．"Excuse me,sir,but I think it's only fair to tell you that it's now or never if you want me in your next picture．A lot of big companies are after me."Instead of pushing away the boy,the director got interested in Larry's words and stopped．"Yes?Which companies?"he asked."Well,"replied the boy,"there's the telephone company,the gas company,and the electric company,to tell you only a few."The director laughed,then wrote something on a card and handed it to the young man．"Come and see me tomorrow."Larry got a small part in the director's next film．He was on his way!He was on his wayrefers to the fact that__.A.he gave up and returned homeB.he began to work towards successC.he took a journey to HollywoodD.he had difficulties in playing the small part
Californian Michael Schwabe said goodbye to the gas pump two years ago．He leased an electric car．Schwabe says he gets more out of driving an electric car than just a charge."With the price of gasoline and with the problems with clean air,it's important we get electric vehicles out on the road."On California roads there are about two thousand electric cars．By 2003,ten percent of all new cars may be required to have zero emissions．This is a mandate automakers say it is way ahead of its time.Gloria Bergquist of the Alliance of Auto Manufacturers says,"The technology(for zero emissions)isn't here yet;it still needs advancement in driving range to make it more appealing to a wider consumer audience."Auto makers blame it on the batteries．Power runs out on most cars after about 70 miles．However,some cars can now go more than 100 miles on a charge．Batteries are expensive．Carmakers say there is nothing they can do about it.Tim Carmichael of the Clean Air Coalition says,"The automakers have not built a vehicle unless required to do so,so it's very important for the state to stay committed to this program requiting automakers to build small amounts in beginning years and then the market will take off."When did Michael Schwabe say goodbye to the gas pump?A.Two days agB.Two months agC.Two years agD.Ten years ag
Text 3 Olivia Pedersen thought the Nissan Leaf parked outside her favourite lunch spot near Emory University,must be hers.But she could not open the door.Nor could she open the door of the identical Leaf behind it.Cautiously,she tried the third Leaf in line and happily drove away.More than 14,000 electric vehicles are now registered in Georgia;California is Lhe only state with more.But the juicy state incentives for buying ihem are coming under aUack.Residents can claim an income-tax credit for 20%of the cost of leasing or purchasing an electric vehicle,up to$5,000.Combined with a possible federal tax incentive worth$7,500,savvy Georgians are driving all the way to the bank in nearly-free electric cars.Nissan sells more of its Leaf models in Adanta than in any other city,according to Don Francis from Georgia,which promotes the use of cars like these.Such trends motivated Chuck Martin,a representative in Georgia's House,to sponsor a bill to end state incentives for electric vehicles.He argues that the income-tax credit costs too much-about$13.6m in 2013-and that only urban types benefit from these sorts of cars.Mr Martin's bill was voted down in committee in February,but seems to be still breathing.Another House bill,mostly to finance transport projects,would reduce the credits;it is now before the Senate.Fans of electric vehicles say Ceorgia now leads the country in clean transport.Local power companies have helped by offering off-peak prices of l.3 cents per kilowatt hour for charging the cars at night.And the sales tax levied on this power stays in the state,whereas cash spent on petrol largely goes elsewhere,says Jeff Cohen,founder of the Atlanta Electric Vehicle Development Coalition.Cutting the credits alLogether might also harm Georgia in other ways.A study by Keybridge Public Policy Economics,a consultancy,says the stale could lose$252m by 2030 if they disap-pear and people buy gas-guzzlers instead.That is because drivers will spend$714m on petrol to get around（in contrast with the$261m they would have paid in electricity bills）,and will no longer fritter away their savings from the federal electric-vehicle tax crediL in Georgia's shops.But the state's incentives may be safe in the legislature after all;the president of the Senate drives an electric car himself.A study suggests that cutting the credits in Georgia might______A.boost economic growthB.do harm to the marketC.reduce vehicle salesD.lead to greater loss
Text 3 Olivia Pedersen thought the Nissan Leaf parked outside her favourite lunch spot near Emory University,must be hers.But she could not open the door.Nor could she open the door of the identical Leaf behind it.Cautiously,she tried the third Leaf in line and happily drove away.More than 14,000 electric vehicles are now registered in Georgia;California is Lhe only state with more.But the juicy state incentives for buying ihem are coming under aUack.Residents can claim an income-tax credit for 20%of the cost of leasing or purchasing an electric vehicle,up to$5,000.Combined with a possible federal tax incentive worth$7,500,savvy Georgians are driving all the way to the bank in nearly-free electric cars.Nissan sells more of its Leaf models in Adanta than in any other city,according to Don Francis from Georgia,which promotes the use of cars like these.Such trends motivated Chuck Martin,a representative in Georgia's House,to sponsor a bill to end state incentives for electric vehicles.He argues that the income-tax credit costs too much-about$13.6m in 2013-and that only urban types benefit from these sorts of cars.Mr Martin's bill was voted down in committee in February,but seems to be still breathing.Another House bill,mostly to finance transport projects,would reduce the credits;it is now before the Senate.Fans of electric vehicles say Ceorgia now leads the country in clean transport.Local power companies have helped by offering off-peak prices of l.3 cents per kilowatt hour for charging the cars at night.And the sales tax levied on this power stays in the state,whereas cash spent on petrol largely goes elsewhere,says Jeff Cohen,founder of the Atlanta Electric Vehicle Development Coalition.Cutting the credits alLogether might also harm Georgia in other ways.A study by Keybridge Public Policy Economics,a consultancy,says the stale could lose$252m by 2030 if they disap-pear and people buy gas-guzzlers instead.That is because drivers will spend$714m on petrol to get around（in contrast with the$261m they would have paid in electricity bills）,and will no longer fritter away their savings from the federal electric-vehicle tax crediL in Georgia's shops.But the state's incentives may be safe in the legislature after all;the president of the Senate drives an electric car himself.Chuck Martin seek8 to end state incentives for electric vehicles because______A.the policy proves to be costlyB.no one benefits from the policyC.the govemment is short of moneyD.these incentives will hurt economy
Text 3 Olivia Pedersen thought the Nissan Leaf parked outside her favourite lunch spot near Emory University,must be hers.But she could not open the door.Nor could she open the door of the identical Leaf behind it.Cautiously,she tried the third Leaf in line and happily drove away.More than 14,000 electric vehicles are now registered in Georgia;California is Lhe only state with more.But the juicy state incentives for buying ihem are coming under aUack.Residents can claim an income-tax credit for 20%of the cost of leasing or purchasing an electric vehicle,up to$5,000.Combined with a possible federal tax incentive worth$7,500,savvy Georgians are driving all the way to the bank in nearly-free electric cars.Nissan sells more of its Leaf models in Adanta than in any other city,according to Don Francis from Georgia,which promotes the use of cars like these.Such trends motivated Chuck Martin,a representative in Georgia's House,to sponsor a bill to end state incentives for electric vehicles.He argues that the income-tax credit costs too much-about$13.6m in 2013-and that only urban types benefit from these sorts of cars.Mr Martin's bill was voted down in committee in February,but seems to be still breathing.Another House bill,mostly to finance transport projects,would reduce the credits;it is now before the Senate.Fans of electric vehicles say Ceorgia now leads the country in clean transport.Local power companies have helped by offering off-peak prices of l.3 cents per kilowatt hour for charging the cars at night.And the sales tax levied on this power stays in the state,whereas cash spent on petrol largely goes elsewhere,says Jeff Cohen,founder of the Atlanta Electric Vehicle Development Coalition.Cutting the credits alLogether might also harm Georgia in other ways.A study by Keybridge Public Policy Economics,a consultancy,says the stale could lose$252m by 2030 if they disap-pear and people buy gas-guzzlers instead.That is because drivers will spend$714m on petrol to get around（in contrast with the$261m they would have paid in electricity bills）,and will no longer fritter away their savings from the federal electric-vehicle tax crediL in Georgia's shops.But the state's incentives may be safe in the legislature after all;the president of the Senate drives an electric car himself.According to Paragraph l,Georgia may______A.be under attack for its unreasonable policiesB.encourage people to purchase electric vehiclesC.end state incentives for buying electric cars soonD.have the largest number of electric cars in America
Text 3 Olivia Pedersen thought the Nissan Leaf parked outside her favourite lunch spot near Emory University,must be hers.But she could not open the door.Nor could she open the door of the identical Leaf behind it.Cautiously,she tried the third Leaf in line and happily drove away.More than 14,000 electric vehicles are now registered in Georgia;California is Lhe only state with more.But the juicy state incentives for buying ihem are coming under aUack.Residents can claim an income-tax credit for 20%of the cost of leasing or purchasing an electric vehicle,up to$5,000.Combined with a possible federal tax incentive worth$7,500,savvy Georgians are driving all the way to the bank in nearly-free electric cars.Nissan sells more of its Leaf models in Adanta than in any other city,according to Don Francis from Georgia,which promotes the use of cars like these.Such trends motivated Chuck Martin,a representative in Georgia's House,to sponsor a bill to end state incentives for electric vehicles.He argues that the income-tax credit costs too much-about$13.6m in 2013-and that only urban types benefit from these sorts of cars.Mr Martin's bill was voted down in committee in February,but seems to be still breathing.Another House bill,mostly to finance transport projects,would reduce the credits;it is now before the Senate.Fans of electric vehicles say Ceorgia now leads the country in clean transport.Local power companies have helped by offering off-peak prices of l.3 cents per kilowatt hour for charging the cars at night.And the sales tax levied on this power stays in the state,whereas cash spent on petrol largely goes elsewhere,says Jeff Cohen,founder of the Atlanta Electric Vehicle Development Coalition.Cutting the credits alLogether might also harm Georgia in other ways.A study by Keybridge Public Policy Economics,a consultancy,says the stale could lose$252m by 2030 if they disap-pear and people buy gas-guzzlers instead.That is because drivers will spend$714m on petrol to get around（in contrast with the$261m they would have paid in electricity bills）,and will no longer fritter away their savings from the federal electric-vehicle tax crediL in Georgia's shops.But the state's incentives may be safe in the legislature after all;the president of the Senate drives an electric car himself.Supporters of electric vehicles believe that these cars are______A.convenient to charge and duty-freeB.powerful and good to environmentC.environmental-friendly and money-savingD.inexpensive and faster than traditional cars
根据以下材料，回答There is little debate about the firstdevelopment of the energy system of the 22nd century--that most of the energyproduced on a large scale will be in the form of electric power. Thus, most presentconcepts for major long-term energy sources (solar, geothermal, fusion) are basedupon electric power production at central plants.The second major development is thepotential use of hydrogen as both a basic fuel to replace natural gas and aspart of a general system to convert, store and transmit electric energy overlong district by fuel cells, or it could be used directly as a fuel forcommercial, industrial or transportation purposes.Although hydrogen seems likely to play amajor role in the future as a form of energy transport and storage, other processesmay also be useful. Here we note only two possibilities.Flywheels: It appears to be workable toconstruct flywheels of almost any needed size that would be efficientconverters (93-95 percent) in first storing and then releasing electric power.In addition, the kinetic (动力的) energy ofrotation is easily converted to alternating electric power. But the engineeringis at an early stage of development, and a decade or more may pass before this potentialcan be reliably estimated.Batteries and fuel cells: some of the manybatteries being developed today look quite promising. Within a decade or two, abattery-operated electric auto might even become competitive with today′ s vehicles,at least for driving ranges up to 200 miles. An electric automobile would bepollution-free,and would probably be more energy-efficient than theinternal-combustion (内燃) engine.A fuel cell (which may be considered a hydridebattery) with about 40 percent conversion efficiency is expected to enter powerproduction on a large scale within about five years. Unlike steam-poweredgenerators, fuel cells can be made large or small and their efficiency inoperation is essentially independent of the loading. Thus they may avoid mostof the distribution costs of electric power as well as provide pollution-fleepower and offer opportunities for using the "waste heat" effectively.From the passage we can see that thefuel cell might be something ___________.A.with the electric energy stored in itwithout pollutionB.in which chemicals are containedC.in which certain fuels such as hydrogenare filledD.like a small steam generator
根据以下材料，回答There is little debate about the firstdevelopment of the energy system of the 22nd century--that most of the energyproduced on a large scale will be in the form of electric power. Thus, most presentconcepts for major long-term energy sources (solar, geothermal, fusion) are basedupon electric power production at central plants.The second major development is thepotential use of hydrogen as both a basic fuel to replace natural gas and aspart of a general system to convert, store and transmit electric energy overlong district by fuel cells, or it could be used directly as a fuel forcommercial, industrial or transportation purposes.Although hydrogen seems likely to play amajor role in the future as a form of energy transport and storage, other processesmay also be useful. Here we note only two possibilities.Flywheels: It appears to be workable toconstruct flywheels of almost any needed size that would be efficientconverters (93-95 percent) in first storing and then releasing electric power.In addition, the kinetic (动力的) energy ofrotation is easily converted to alternating electric power. But the engineeringis at an early stage of development, and a decade or more may pass before this potentialcan be reliably estimated.Batteries and fuel cells: some of the manybatteries being developed today look quite promising. Within a decade or two, abattery-operated electric auto might even become competitive with today′ s vehicles,at least for driving ranges up to 200 miles. An electric automobile would bepollution-free,and would probably be more energy-efficient than theinternal-combustion (内燃) engine.A fuel cell (which may be considered a hydridebattery) with about 40 percent conversion efficiency is expected to enter powerproduction on a large scale within about five years. Unlike steam-poweredgenerators, fuel cells can be made large or small and their efficiency inoperation is essentially independent of the loading. Thus they may avoid mostof the distribution costs of electric power as well as provide pollution-fleepower and offer opportunities for using the "waste heat" effectively.In which of the following is the use ofthe "waste heat" mentioned?A.The fuel cell.B.The fly wheel.C.The steam-powered generator.D.The internal-combustion engine.
根据以下材料，回答There is little debate about the firstdevelopment of the energy system of the 22nd century--that most of the energyproduced on a large scale will be in the form of electric power. Thus, most presentconcepts for major long-term energy sources (solar, geothermal, fusion) are basedupon electric power production at central plants.The second major development is thepotential use of hydrogen as both a basic fuel to replace natural gas and aspart of a general system to convert, store and transmit electric energy overlong district by fuel cells, or it could be used directly as a fuel forcommercial, industrial or transportation purposes.Although hydrogen seems likely to play amajor role in the future as a form of energy transport and storage, other processesmay also be useful. Here we note only two possibilities.Flywheels: It appears to be workable toconstruct flywheels of almost any needed size that would be efficientconverters (93-95 percent) in first storing and then releasing electric power.In addition, the kinetic (动力的) energy ofrotation is easily converted to alternating electric power. But the engineeringis at an early stage of development, and a decade or more may pass before this potentialcan be reliably estimated.Batteries and fuel cells: some of the manybatteries being developed today look quite promising. Within a decade or two, abattery-operated electric auto might even become competitive with today′ s vehicles,at least for driving ranges up to 200 miles. An electric automobile would bepollution-free,and would probably be more energy-efficient than theinternal-combustion (内燃) engine.A fuel cell (which may be considered a hydridebattery) with about 40 percent conversion efficiency is expected to enter powerproduction on a large scale within about five years. Unlike steam-poweredgenerators, fuel cells can be made large or small and their efficiency inoperation is essentially independent of the loading. Thus they may avoid mostof the distribution costs of electric power as well as provide pollution-fleepower and offer opportunities for using the "waste heat" effectively.The energy we use most todayis___________A.solar energy B.geothermal energyC.hydrogen D.electricity
单选题His wife says that he was more frugal in his youth than later years.AlistlessBrobustCthriftyDgullible
单选题Why did she want Michael Jackson’s manager to be her manager too?AShe knew he was associated with many record producers.BShe was impressed by what he had done for Michael Jackson.CShe wanted to be more famous than Michael Jackson.
单选题Before attempting to put out a class “C” fire involving an electric-driven centrifugal pump, you should FIRST （）.Ainsulate your shoesBground the fire hoseCsecure its power supplyDstart the fire pump
单选题“A centrifuge consists of an electric motor driving a vertical shaft on the top of which is mounted the bowl assembly”.According to this sentence, we can know that is mounted on the top of the vertical shaft（）Aa centrifugeBan electric motorCa bowl assemblyDa driving motor
单选题If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably（）.Aexcessive pump speedBexcessive suction headCworn wearing ringsDgross pump misalignment
单选题When there is a fire in a large electric motor, normally the very FIRST step is to （）Asecure the electric supplyBventilate area to remove smokeCstart the fire pump and lead out hoseDapply foam
单选题The gas reserves in the far west and off the eastern and southern coasts of China ______.Ahave been tapped for more than 50 years.Bhave an output that is failing.Care just beginning to be tapped.Dare not nearly enough to provide for the nation’s fuel consumption.