单选题Scientists say it may be five or six years _____ this medicine is tested on human beings.AsinceBbeforeCafterDwhen
单选题
Scientists say it may be five or six years _____ this medicine is tested on human beings.
A
since
B
before
C
after
D
when
参考解析
解析：
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Now satellites are 36 to forecast（预报）the weather. They are in space, and they can 37 any part of the world. The satellites take pictures of the atmosphere（大气），38 this is where the weather forms（形成）. They send these 39 to the weather stations. So meteorologists（气象学家）can see the weather of any part of the world. From the pictures, the scientists can often say 40 the weather will change.Today, nearly five hundred weather stations in sixty countries receive satellite pictures. When they receive new pictures, the meteorologists compare them with earlier 41 . Perhaps they may find that the clouds have changed during the last few hours. This may mean that the 42 on the ground may soon change, too. In their next weather forecast, the meteorologists can say this.So the weather satellites are a great 43 to the meteorologists. 44 __satellites were invented, the scientists could forecast the weather for about 24 or 48 hours. Now they can make good forecasts for three or five days. Soon, perhaps, they may 45 forecast the weather for a week or more ahead（提前）.36.________________A. help B. to help C. helped D. helping
Medicine DirectionsTake two tablets with warm water, followed by one tablet every eight hours, as required. For maximum nighttime and early morning relief, take two tablets at bedtime. Do not exceed six tablets in twenty-four hours.For children six to twelve years old, give half the adult dosage. For children under six years old consult your doctor.Reduce dosage if nervousness, restlessness, or sleeplessness occurs.The label on this medicine bottle clearly warns not to take more than ______.A．twenty-four tablets a dayB．eight tablets a dayC．six tablets a dayD．three tablets a day
Clearly the medicine ______.A．may be dangerous for small childrenB．can't be taken by children under twelve years oldC．may be taken by children but not by adultsD．may be taken by adults but not by children
__________you suspect something, I may as well tell you the whole truth.A． SinceB． UntilC． AfterD． While
根据下列材料请回答 31～35 题：ANow satellites are helping to forecast the weather．They are in space，and they can reach any part of the world．The satellites take pictures of the atmosphere(大气)，because this is where the weather form．They send these pictures to the weather stations．So meteorologists(气象学家)can see the weather of any part of the world．From the pictures，the scientists can often say how the weather will change．Today，nearly five hundred weather stations in sixty countries receive satellite pictures．When they receive new pictures，the meteorologists compare them with earlier ones．Perhaps they may find that the clouds have changed during the last few hours．This may mean that the weather on the ground may soon change，too．In their next weather forecast，the meteorologists can say this．So the weather satellites are a great help to the meteorologists．Before satellites were invented，the scientists could forecast the weather for about 24 0r 48 hours．Now they can make good forecasts for three or five days．Soon，perhaps，they may be able to forecast the weather for a week or more ahead．第 31 题 Satellites travel______．A．in spaceB．in the atmosphereC．above the groundD．above space
Cargo booms must be weight tested to recertify the Safe Working Load（SWL）every ______．A.YearB.Two yearsC.Four yearsD.Five years
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval ________．A.They are not subject to permanent magnetism; no check is necessaryB.SemiannuallyC.AnnuallyD.Every five years
The doctor explained to the students the hazards of radiation upon human beings.A:dangers B:evilsC:impacts D:benefits
共用题干Cloning（克隆）:Future Pertect?1 A clone is an exact copy of a plant or animal produced from any one cell.Since Scottish scientists reported that they had managed to clone a sheep named Dolly in 1997,research into cloning has grown rapidly.In May 1998,scientists in Massachusetts managed to create two identical calves（牛犊）using cloning technology. A mouse has also been cloned successfully.But the debate over cloning humans really started when Chicago physicist Richard Seed made a surprising announcement:"We will have managed to clonen a human being within the next two years."he told the world.2 Seed's announcement provoked a lot of media attention,most of it negative.In Europe, nineteen nations have already signed an agreement banning human cloning and in the U.S. the President announced:"We will be introducing a law to ban all human cloning and many states in the U.S. will have passed anti-cloning laws by the end of the year."3 Many researchers are not so negative about cloning.They are worried that laws banning human cloning will threaten important research.In March,The New England Joumal of Medicine called any plan to ban research on cloning humans seriously mistaken.Many researchers also believe that in spite of attempts to ban it,human cloning will have become routine by 2010 because it is impossible to stop the progress of science.4 Is there reason to fear that cloning will lead to a nightmare world?The public has been bombarded（轰炸）with newspaper articles , television shows and films , as well as cartoons.Such information is often misleading,and makes people wonder what on earth the scientists will be doing next.5 Within the next five to ten years scientists will probably have found a way of cioning humans.It could be that pretty soon we will be able to choose the person that we want our child to look like.But how would it feel to be a clone among hundreds,the anti-cloners ask. Pretty cool , answer the pro-cloners（赞成克隆的人）. Within ten years scientists will probably have______.A:the nucleus of a cellB:cloned human beingsC:a human being in two yearsD:a law to ban human cloningE:a report on human cloningF:heavy media coverage
共用题干Cloning（克隆）:Future Pertect?1 A clone is an exact copy of a plant or animal produced from any one cell.Since Scottish scientists reported that they had managed to clone a sheep named Dolly in 1997,research into cloning has grown rapidly.In May 1998,scientists in Massachusetts managed to create two identical calves（牛犊）using cloning technology. A mouse has also been cloned successfully.But the debate over cloning humans really started when Chicago physicist Richard Seed made a surprising announcement:"We will have managed to clonen a human being within the next two years."he told the world.2 Seed's announcement provoked a lot of media attention,most of it negative.In Europe, nineteen nations have already signed an agreement banning human cloning and in the U.S. the President announced:"We will be introducing a law to ban all human cloning and many states in the U.S. will have passed anti-cloning laws by the end of the year."3 Many researchers are not so negative about cloning.They are worried that laws banning human cloning will threaten important research.In March,The New England Joumal of Medicine called any plan to ban research on cloning humans seriously mistaken.Many researchers also believe that in spite of attempts to ban it,human cloning will have become routine by 2010 because it is impossible to stop the progress of science.4 Is there reason to fear that cloning will lead to a nightmare world?The public has been bombarded（轰炸）with newspaper articles , television shows and films , as well as cartoons.Such information is often misleading,and makes people wonder what on earth the scientists will be doing next.5 Within the next five to ten years scientists will probably have found a way of cioning humans.It could be that pretty soon we will be able to choose the person that we want our child to look like.But how would it feel to be a clone among hundreds,the anti-cloners ask. Pretty cool , answer the pro-cloners（赞成克隆的人）. Richard Seed's announcement received_________.A:the nucleus of a cellB:cloned human beingsC:a human being in two yearsD:a law to ban human cloningE:a report on human cloningF:heavy media coverage
Can animals be made to work for us?Some scientists think that one day animals may be trained to do a number of simple jobs that are now done by human beings.They point out that at a circus,for example,we may see elephants,monkeys,dogs and other animals doing quite skillful things．Perhaps you have seen them on the television or in a film．If you watch closely,you may notice that the trainer always gives the animal a piece of candy or a piece of fruit as a reward．The scientists say that many different animals may be trained to do a number of simple jobs if they know they will get a reward for doing them.Of course,as we know,dogs can be used to guard a house,and soldiers in both old and modem times have used geese to give warning by making a lot of noise when a stranger or an enemy comes near．But it may be possible to train animals to work in factories．In Russia,for example,pigeons which are birds with good eyesight,are being used to watch out for faults in small steel balls that are being made in one factory．When the pigeon sees a ball which looks different from others,it touches a steel plate with its beak．This turns on a light to warn people in the factory．At the same time a few seeds are given as a reward．It takes three to five weeks to train a pigeon to do this and one pigeon can inspect 3 000 to 4 000 balls an hour.Apes have been used in America in helping to make cars,and scientists believe that these large monkeys may be one day gather crops and even drive trains.The trainer usually gives the animal a piece of candy or fruit__.A.when it is hungryB.before it plays a trickC.when it starts to play a trickD.after it has done the trick
Can animals be made to work for us?Some scientists think that one day animals may be trained to do a number of simple jobs that are now done by human beings.They point out that at a circus,for example,we may see elephants,monkeys,dogs and other animals doing quite skillful things．Perhaps you have seen them on the television or in a film．If you watch closely,you may notice that the trainer always gives the animal a piece of candy or a piece of fruit as a reward．The scientists say that many different animals may be trained to do a number of simple jobs if they know they will get a reward for doing them.Of course,as we know,dogs can be used to guard a house,and soldiers in both old and modem times have used geese to give warning by making a lot of noise when a stranger or an enemy comes near．But it may be possible to train animals to work in factories．In Russia,for example,pigeons which are birds with good eyesight,are being used to watch out for faults in small steel balls that are being made in one factory．When the pigeon sees a ball which looks different from others,it touches a steel plate with its beak．This turns on a light to warn people in the factory．At the same time a few seeds are given as a reward．It takes three to five weeks to train a pigeon to do this and one pigeon can inspect 3 000 to 4 000 balls an hour.Apes have been used in America in helping to make cars,and scientists believe that these large monkeys may be one day gather crops and even drive trains.Many animals may be trained to do simple jobs if they know__.A.who their trainers areB.they will be praised by theft trainersC.they will get a rewardD.something dangerous will happen to them
Can animals be made to work for us?Some scientists think that one day animals may be trained to do a number of simple jobs that are now done by human beings.They point out that at a circus,for example,we may see elephants,monkeys,dogs and other animals doing quite skillful things．Perhaps you have seen them on the television or in a film．If you watch closely,you may notice that the trainer always gives the animal a piece of candy or a piece of fruit as a reward．The scientists say that many different animals may be trained to do a number of simple jobs if they know they will get a reward for doing them.Of course,as we know,dogs can be used to guard a house,and soldiers in both old and modem times have used geese to give warning by making a lot of noise when a stranger or an enemy comes near．But it may be possible to train animals to work in factories．In Russia,for example,pigeons which are birds with good eyesight,are being used to watch out for faults in small steel balls that are being made in one factory．When the pigeon sees a ball which looks different from others,it touches a steel plate with its beak．This turns on a light to warn people in the factory．At the same time a few seeds are given as a reward．It takes three to five weeks to train a pigeon to do this and one pigeon can inspect 3 000 to 4 000 balls an hour.Apes have been used in America in helping to make cars,and scientists believe that these large monkeys may be one day gather crops and even drive trains.What made scientists think animal can be made to work for us one day?A.Animals are very skillful at a circuB.They are big and stronC.Some animals are as clever as human beingD.Animals can be trained because they like to get something as a rewar
Can animals be made to work for us?Some scientists think that one day animals may be trained to do a number of simple jobs that are now done by human beings.They point out that at a circus,for example,we may see elephants,monkeys,dogs and other animals doing quite skillful things．Perhaps you have seen them on the television or in a film．If you watch closely,you may notice that the trainer always gives the animal a piece of candy or a piece of fruit as a reward．The scientists say that many different animals may be trained to do a number of simple jobs if they know they will get a reward for doing them.Of course,as we know,dogs can be used to guard a house,and soldiers in both old and modem times have used geese to give warning by making a lot of noise when a stranger or an enemy comes near．But it may be possible to train animals to work in factories．In Russia,for example,pigeons which are birds with good eyesight,are being used to watch out for faults in small steel balls that are being made in one factory．When the pigeon sees a ball which looks different from others,it touches a steel plate with its beak．This turns on a light to warn people in the factory．At the same time a few seeds are given as a reward．It takes three to five weeks to train a pigeon to do this and one pigeon can inspect 3 000 to 4 000 balls an hour.Apes have been used in America in helping to make cars,and scientists believe that these large monkeys may be one day gather crops and even drive trains.Which of the following is not true?A.Scientists consider apes may drive trains some daB.Apes have worked in some factorieC.Apes may one day be used to gather cropD.An ape is not a large monke
Scientists say climate change and human activity have increasingly led to the melting of ______ pieces of Antarctic ice.A.massiveB.quantitativeC.surplusD.formidable
Can animals be made to work for us?Some scientists think that one day animals may be trained?to do a number of simple jobs that are now done by human beings.They point out that at a circus,for example,we may see elephants,monkeys,dogs and other ani-mals doing quite skillful things.Perhaps you have seen them on the television or in a film.If you?watch closely,you may notice that the trainer always gives the animal a piece of candy or a piece of?fruit as a reward.The scientists say that many different animals may be trained to do a number of?simple jobs if they know they will get a reward for doing them.Of course,as we know,dogs can be used to guard a house,and soldiers in both old and modern?times have used geese to give warning by making a lot of noise when a stranger or an enemy comes?near.But it may be possible to train animals to work in factories.In Russia,for example,pigeons?which are birds with good eyesight,are being nsed to watch out for faults in small steel balls that are?being made in one factory.When the pigeon sees a ball which looks different from others,it touches a?steel plate with its beak.This turns on a light to warn people in the factory.At the same time a few?seeds are given as a reward.It takes three to five weeks to train a pigeon to do this and one pigeon?can inspect 3,000 to 4,000 balls an hour.Apes have been used in America in helping to make cars,and scientists believe that these large?monkeys may be one day gather crops and even drive trains.Which of the following is NOT true?A.Scientists consider apes may drive trains some day.B.Apes have worked in some factories.C.Apes may one day be used to gather crops.D.An ape is not a large monkey.
单选题You are ordering ship’s stores. Which statement is TRUE?（）.AUp to five gallons of a flammable liquid may be stowed in the engine roomBAll stores of line，rags，linens and other similar type stores must be certified by UL as being fire retardantCCylinders containing compressed gasses must be constructed and tested in accordance with the Bureau of StandardsDAll distress flares when received must be stored in the portable magazine chest
单选题The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.AThey are not subject to permanent magnetism; no check is necessaryBSemiannuallyCAnnuallyDEvery five years
单选题It takes at least five to ten years______it is possible to test this medicine on human patients.AbeforeBsinceCafterDwhen
单选题Scientists say it may be five or six years _____ this medicine is tested on human beings.AsinceBbeforeCafterDwhen
单选题Shipboard Oil Pollution Emergency Plans must be reviewed（）.Aannually by the owner，with a letter submitted six months before expirationBonly once every five years，with a letter submitted six months before expirationCand the entire plan resubmitted for approval once every five years，six months before expirationDannually by the owner，with a letter submitted to the Coast Guard within one month of the anniversary date of the plan approval