单选题In fisheries in general, when a large harvest is taken one year, there will be fewer fish available to be harvested in the following year, leading to decreasing yields of most fish species over time. The Maine lobster is an anomaly, however. Even though the vast number of lobster traps covering the New England coast pull in more lobsters every year, the number of lobsters in the water has shown no signs of decreasing. Which of the following, if true, most helps to explain the apparent anomaly concerning the number of Maine lobsters?AThe decline of other fish species in the region has deprived the lobster of its natural food source of scavenged fish.BThe bait in lobster traps provides abundant food for young lobsters, which are still small enough to swith out of the traps, leading to much higher survival rates among young lobsters than would be expected in nature.CAs global warming heats the waters of the Atlantic coastline, the Maine lobster has extended its northern range to well past Nova Scotia.DThe ever, increasing demand for lobsters in seafood restaurants and steakhouses across the country has driven a corresponding increase in the supply of the product.EThe increased lobster harvest has resulted in many juvenile lobsters but very few breeding- age lobsters, which could result in a crash in lobster numbers in the near future.
单选题
In fisheries in general, when a large harvest is taken one year, there will be fewer fish available to be harvested in the following year, leading to decreasing yields of most fish species over time. The Maine lobster is an anomaly, however. Even though the vast number of lobster traps covering the New England coast pull in more lobsters every year, the number of lobsters in the water has shown no signs of decreasing. Which of the following, if true, most helps to explain the apparent anomaly concerning the number of Maine lobsters?
A
The decline of other fish species in the region has deprived the lobster of its natural food source of scavenged fish.
B
The bait in lobster traps provides abundant food for young lobsters, which are still small enough to swith out of the traps, leading to much higher survival rates among young lobsters than would be expected in nature.
C
As global warming heats the waters of the Atlantic coastline, the Maine lobster has extended its northern range to well past Nova Scotia.
D
The ever, increasing demand for lobsters in seafood restaurants and steakhouses across the country has driven a corresponding increase in the supply of the product.
E
The increased lobster harvest has resulted in many juvenile lobsters but very few breeding- age lobsters, which could result in a crash in lobster numbers in the near future.
参考解析
解析：
B项中提到捕食龙虾使得年幼的龙虾的存活率增高，给题目中提到的龙虾数量的异常提供了一个可能的解释，故本题选B项。
B项中提到捕食龙虾使得年幼的龙虾的存活率增高，给题目中提到的龙虾数量的异常提供了一个可能的解释，故本题选B项。
相关考题：
阅读下面短文,根据短文内容,在短文后81－85小题中句子空白处填入适当的词语或句子。We know that m 阅读下面短文，根据短文内容，在短文后８１－８５小题中句子空白处填入适当的词语或句子。We know that many animals do not stay in one place. Birds, fish and other animals move from one place to another place at a certain time. They move for different reasons: most of them move to find food more easily, but others move to get away from places that are too crowded.When cold weather comes, many birds move to warmer places to find food. Some fishes give birth in warm water and move to cold water to feed. The most famous migration is probably the migration of fish, which is called “salmon”（鲑鱼）. This fish is born in fresh water but it travels many miles to salt water. There it spends its life. When it is old, it returns to its birthplace in fresh water. Then it gives birth and dies. In northern Europe, there is a kind of mouse. They leave their mountain homes when they become too crowded. They move down to the low land. Sometimes they move all the way to the seaside, and many of them are killed when they fall into the sea.Recently, scientists have studied the migration of a kind of lobster(龙虾). Every year, when the season of the bad weather arrives, the lobsters get into a long line and start to walk across the floor of the ocean. Nobody knows why they do this, and nobody knows where the go. So, sometimes we know why humans and animals move from one place to another place, but at other times we don’t. Maybe living things just like to travel.81. The reason for most of the animals to move is _____________________.
The experiment showed that the smaller fish .A. fought over a feast B. went on diet willinglyC. preferred some extra food D. challenged the boss fish
_________the new pop singer built her first album piece by piece.A． Over a year and a halfB． Over half and a yearC． Over one and a half yearD． Over year and half
Text 3When prehistoric man arrived in new parts of the world, something strange happened to the large animals. They suddenly became extinct. Smaller species survived. The large, slow-growing animals were easy game, and were quickly hunted to extinction. Now something similar could be happening in the oceans.That the seas are being overfished has been known for years. What researchers such as Ransom Myers and Boris Worm have shown is just how fast things are changing. They have looked at half a century of data from fisheries around the world. Their methods do not attempt to estimate the actual biomass (the amount of living biological matter) of fish species in particular parts of the ocean, but rather changes in that biomass over time. According to their latest paper published in Nature, the biomass of large predators (animals that kill and eat other animals) in a new fishery is reduced on average by 80% within 15 years of the start of exploitation. In some long-fished areas, it has halved again since then.Dr. Worm acknowledges that the figures are conservative. One reason for this is that fishing technology has improved. Today’s vessels can find their prey using satellites and sonar, which were not available 50 years ago. That means a higher proportion of what is in the sea is being caught, so the real difference between present and past is likely to be worse than the one recorded by changes in catch sizes. In the early days, too, longlines would have been more saturated with fish. Some individuals would therefore not have been caught, since no baited hooks would have been available to trap them, leading to an underestimate of fish stocks in the past. Furthermore, in the early days of longline fishing, a lot of fish were lost to sharks after they had been hooked. That is no longer a problem, because there are fewer sharks around now.Dr. Myers and Dr. Worm argue that their work gives a correct baseline, which future management efforts must take into account. They believe the data support an idea current among marine biologists, that of the “shifting baseline.” The notion is that people have failed to detect the massive changes which have happened in the ocean because they have been looking back only a relatively short time into the past. That matters because theory suggests that the maximum sustainable yield that can be cropped from a fishery comes when the biomass of a target species is about 50% of its original levels. Most fisheries are well below that, which is a bad way to do business.31. The extinction of large prehistoric animals is noted to suggest that ________.[A] large animal were vulnerable to the changing environment[B] small species survived as large animals disappeared[C] large sea animals may face the same threat today[D] slow-growing fish outlive fast-growing ones
CGUATEMALA CITY （Reuters） – A fish that lives in mangrove swamps（红树沼泽）across the Americas can live out of water for months at a time, similar to how animals adapted（适应）to land millions of years ago, a new study shows.The Magrove Rivulus, a type of small killifish, lives in small pools of water in a certain type of empty nut or even old beer cans in the mangrove swamps of Belize, the United States and Brazil. When their living place dries up, they live on the land in logs（圆木），said Scott Taylor, a researcher at the Brevard Endangered Lands Program in Florida.The fish, whose scientific name is Rivulus marmoratus, can grow as large as three inches. They group together in logs and breathe air through their skin until they can find water again.The new scientific discovery came after a trip to Belize.“We kicked over a log and the fish just came crowding out,” Taylor told Reuters in neighboring Guatgemala by telephone. He said he will make his study on the fish known to the public in an American magazine early next year.In lab tests, Taylor said he found the fish can live up to 66 days out of water without eating.Some other fish can live out of water for a short period of time. The walking catfish found in Southeast Asia can stay on land for hours at time, while lungfish found in Australia, Africa and South America can live out of water, but only in an inactive state. But no other known fish can be out of water as long as the Mangrove Rivulus and remain active, according to Patricia Wright, a biologist at Canada’s University of Guelph.Further studies of the fish may tell how animals changed over time.“These animals live in conditions similar to those that existed millions of years ago, when animals began making the transition（过渡）from water onto land,” Wright said.49. The Mangrove Rivulus is a type of fish that _______.A. likes eating nutsB. prefers living in dry placesC. is the longest living fish on earthD. can stay alive for two months out of water
Why is it a problem if all the smaller fish species die?A. It's not healthy for the environment.B. People only like to catch big fish.C. There are too many small fish.D. The smaller fish can get lost in the lake.
which of the following is not one of the major exports of new zealand?A. Wool.B. Oil.C. Dairy products. .D. Fish.
Millions of pounds’ ____ of fish is caught every year around the coasts of Britain.A: worthB: worthyC: worthwhileD: worthless
Fish is______and expensive at this time of the year in this area.A．in large measureB．to the minimumC．in short supplyD．to the maximum
Every year gray whales migrate from the Bering Sea in Alaska to the Baja Peninsula in Mexico.Eleven gray whales have died in the San Francisco Bay in the last three weeks．No one knows why the whales are dying.Last year 270 whales died along the whales'migration route．Many people think starvation is the cause．This year the dead whales seem to have more blubber(fat)on them.Twenty years ago,the gray whale was listed as an endangered species.Some scientists think that the larger number of whales makes it hard to find enough food．More whales create more pressure on the food supply,a supply that some scientists say may have dwindled as a result of the warm waters of El Nino.Most of the whales have been dead for many days before they are found and studied．This makes it hard to find the reason for death.65 whales have been seen in the San Francisco Bay Area this year compared to 17 last year．The whales could be dying from many diseases,but it may be over-population．Which of the following is NOT a possible reason for whales dying?A.PneumoniB.Brain infectioC.Over-populatioD.Over-eatin
Text 3 It is a good time to be a fisherman.The global fish-price index of the UN's Food and Agricultural Organization（FAO）hit a record high in May.Changing consumer diets,particularly in China,explain much of the sustained upward movement.High oil prices,which increase the cost of fishing and transportation,also add to the price of putting fish on Lhe table.Not all fish are creaLed equal,however.There are two types of fish production:"capture"（or wild）and"aquaculture"（or farmed）.And they seem to be on different tracks.Fish such as tuna,the majority of which is cau~;ht wild,saw much bigger price increases than salmon,which is easier to farm.Overall,the FAO's price index for wild fish nearly doubled between 1990 and 2012,whereas the one for farmed fish rose by only a fifth.What explains this big difference?The amount of wild fish captured globally has barely changed in the past two decades.The ceiling,of about 90m tonnes a year,seems to have been reached at the end of the 1980s.Overfishing is one reason,as is the limited room for produclivity growth,particularly if consumers want high quality.Patrice Guillotreau of the University of Nantes tells the story of a fleet in France that decided to trawl,rather than line-catch,its tuna.It braughi more back to shore,but the fish were damaged.It could not be sold as high-value fillets and was only good for canning.The old ways of catching fish are still best if you want the highest profits,says Mr CuiUotreau.In contrast,the farmed-fish industry continues to make productivity improvements.Fish farms have found crafty ways to use lower quantities of fish meal as feed.In the early days of aquaculture,it could take up to ten pounds of wild fish to produce one pound of salmon.Now the number is down to five.That may still be an inefficient use of protein,but the ratio is set to improve further.Fish farms have also become more energy-efficient,meaning that they are less affected by higher energy pnces.And they have learned how to handle diseases beUer,reducing the quanlity of fish that ends up being unsellable.As a resuli of all these improvements,the global production of farmed fish,measured in tonnes,now exceeds the producUon of beef.Output is likely to continue growing:the FAO estimates thal by 2020 it will reach six times its I990 level.Tuna and salmon are mentioned to show that______A.salmon is not as expensive as tunaB.tuna is more popular among consumersC.wild fish is more precious than farmed fishD.the prices of fish are in fact decided by FAO
Text 3 It is a good time to be a fisherman.The global fish-price index of the UN's Food and Agricultural Organization（FAO）hit a record high in May.Changing consumer diets,particularly in China,explain much of the sustained upward movement.High oil prices,which increase the cost of fishing and transportation,also add to the price of putting fish on Lhe table.Not all fish are creaLed equal,however.There are two types of fish production:"capture"（or wild）and"aquaculture"（or farmed）.And they seem to be on different tracks.Fish such as tuna,the majority of which is cau~;ht wild,saw much bigger price increases than salmon,which is easier to farm.Overall,the FAO's price index for wild fish nearly doubled between 1990 and 2012,whereas the one for farmed fish rose by only a fifth.What explains this big difference?The amount of wild fish captured globally has barely changed in the past two decades.The ceiling,of about 90m tonnes a year,seems to have been reached at the end of the 1980s.Overfishing is one reason,as is the limited room for produclivity growth,particularly if consumers want high quality.Patrice Guillotreau of the University of Nantes tells the story of a fleet in France that decided to trawl,rather than line-catch,its tuna.It braughi more back to shore,but the fish were damaged.It could not be sold as high-value fillets and was only good for canning.The old ways of catching fish are still best if you want the highest profits,says Mr CuiUotreau.In contrast,the farmed-fish industry continues to make productivity improvements.Fish farms have found crafty ways to use lower quantities of fish meal as feed.In the early days of aquaculture,it could take up to ten pounds of wild fish to produce one pound of salmon.Now the number is down to five.That may still be an inefficient use of protein,but the ratio is set to improve further.Fish farms have also become more energy-efficient,meaning that they are less affected by higher energy pnces.And they have learned how to handle diseases beUer,reducing the quanlity of fish that ends up being unsellable.As a resuli of all these improvements,the global production of farmed fish,measured in tonnes,now exceeds the producUon of beef.Output is likely to continue growing:the FAO estimates thal by 2020 it will reach six times its I990 level.The most suitable title for the text is_____A.Wild Fish:Demand Decides PriceB.The Rising Price of Rare Wild FishC.Ffumed Fish:Making ImprovementsD.The Prices of Fishes:Rising Differently
Text 3 It is a good time to be a fisherman.The global fish-price index of the UN's Food and Agricultural Organization（FAO）hit a record high in May.Changing consumer diets,particularly in China,explain much of the sustained upward movement.High oil prices,which increase the cost of fishing and transportation,also add to the price of putting fish on Lhe table.Not all fish are creaLed equal,however.There are two types of fish production:"capture"（or wild）and"aquaculture"（or farmed）.And they seem to be on different tracks.Fish such as tuna,the majority of which is cau~;ht wild,saw much bigger price increases than salmon,which is easier to farm.Overall,the FAO's price index for wild fish nearly doubled between 1990 and 2012,whereas the one for farmed fish rose by only a fifth.What explains this big difference?The amount of wild fish captured globally has barely changed in the past two decades.The ceiling,of about 90m tonnes a year,seems to have been reached at the end of the 1980s.Overfishing is one reason,as is the limited room for produclivity growth,particularly if consumers want high quality.Patrice Guillotreau of the University of Nantes tells the story of a fleet in France that decided to trawl,rather than line-catch,its tuna.It braughi more back to shore,but the fish were damaged.It could not be sold as high-value fillets and was only good for canning.The old ways of catching fish are still best if you want the highest profits,says Mr CuiUotreau.In contrast,the farmed-fish industry continues to make productivity improvements.Fish farms have found crafty ways to use lower quantities of fish meal as feed.In the early days of aquaculture,it could take up to ten pounds of wild fish to produce one pound of salmon.Now the number is down to five.That may still be an inefficient use of protein,but the ratio is set to improve further.Fish farms have also become more energy-efficient,meaning that they are less affected by higher energy pnces.And they have learned how to handle diseases beUer,reducing the quanlity of fish that ends up being unsellable.As a resuli of all these improvements,the global production of farmed fish,measured in tonnes,now exceeds the producUon of beef.Output is likely to continue growing:the FAO estimates thal by 2020 it will reach six times its I990 level.The global fish price is growing because of_____A.the shonage of fishermenB.ever-increasing oil pricesC.the change of Chinese dietsD.high market demand and cost
Text 3 It is a good time to be a fisherman.The global fish-price index of the UN's Food and Agricultural Organization（FAO）hit a record high in May.Changing consumer diets,particularly in China,explain much of the sustained upward movement.High oil prices,which increase the cost of fishing and transportation,also add to the price of putting fish on Lhe table.Not all fish are creaLed equal,however.There are two types of fish production:"capture"（or wild）and"aquaculture"（or farmed）.And they seem to be on different tracks.Fish such as tuna,the majority of which is cau~;ht wild,saw much bigger price increases than salmon,which is easier to farm.Overall,the FAO's price index for wild fish nearly doubled between 1990 and 2012,whereas the one for farmed fish rose by only a fifth.What explains this big difference?The amount of wild fish captured globally has barely changed in the past two decades.The ceiling,of about 90m tonnes a year,seems to have been reached at the end of the 1980s.Overfishing is one reason,as is the limited room for produclivity growth,particularly if consumers want high quality.Patrice Guillotreau of the University of Nantes tells the story of a fleet in France that decided to trawl,rather than line-catch,its tuna.It braughi more back to shore,but the fish were damaged.It could not be sold as high-value fillets and was only good for canning.The old ways of catching fish are still best if you want the highest profits,says Mr CuiUotreau.In contrast,the farmed-fish industry continues to make productivity improvements.Fish farms have found crafty ways to use lower quantities of fish meal as feed.In the early days of aquaculture,it could take up to ten pounds of wild fish to produce one pound of salmon.Now the number is down to five.That may still be an inefficient use of protein,but the ratio is set to improve further.Fish farms have also become more energy-efficient,meaning that they are less affected by higher energy pnces.And they have learned how to handle diseases beUer,reducing the quanlity of fish that ends up being unsellable.As a resuli of all these improvements,the global production of farmed fish,measured in tonnes,now exceeds the producUon of beef.Output is likely to continue growing:the FAO estimates thal by 2020 it will reach six times its I990 level.The production of farmed fish is growing due to the following reasons except_____A.disease controlB.lower labour costC.energy conservationD.reduction of fish feed
资料：There's a good chance that spicy crunchy tuna roll you ordered for lunch doesn't actually contain any tuna at all.That's because 74% of fish sold at sushi venues in the US is mislabeled and often completely different than what's on the menu, according to a 2013 survey from the ocean conservation group Oceana.But new technology could help make the seafood business a bit more transparent. Google is teaming up with Oceana and the aerial and satellite imaging nonprofit SkyTruth to launch Global Fishing Watch this fall, the New York Times reports. The initiative will track and analyze fishing boat practices using satellite technology and, ideally, help ensure that fewer fake or mislabeled fish are swapped in along the way.Seafood providers are also investing in technology to reduce fraud. Boston seafood distributor Red's Best, for example, has increased transparency by selling fish with labels that buyers can scan with their smartphones to access a web page that provides details about the individual fish, including where the fish came from, the New York Times reports.Even if a restaurant serves some real, correctly labeled fish, 95% of the 118 sushi restaurants surveyed by Oceana in cities including New York, Chicago, and Los Angeles had at least one faked sushi item on the menu.Currently, the biggest culprits for fake sushi are snapper （92% misleadingly labeled） and tuna （71%）. White tuna is often swapped for escolar, which is sometimes called the "Ex-Lax Fish, " according to Inside Edition, because it can cause intestinal problems.Roughly 75% of fish labeled snapper isn't even from the snapper family. Because of the predominance of fraud in the supply chain, New York sushi restaurant Sushi Nakazawa refuses to serve red snapper because the risk of fake fish is too high.What can we infer from this passage?（ ）A.Many sushi restaurants refuse to serve some fish because of the risk of fake fish.B.People have access to track the origins of fish sold in sushi shops.C.Most fish sold in sushi stores is mislabeled but new tech can help to fix the problem.D.Citizens in the US no longer trust the fish sold in sushi venues.
—The round bowl over there is a bit small，isn‘t it —_______.A.So are the fishB.So the fish areC.Neither the fishD.Neither are the fish
Which of the following changes might be expected of London by Dickens？( ) A.Here would be less and less polluted air over the sky of London. B.The River Thames might accommodate the fish again. C.London might develop into an even bigger city. D.Londoners would be rid of poverty.
Which of the following changes might be expected of London by Dickens？( ) A.Here would be less and less polluted air over the sky of London B.The River Thames might accommodate the fish again C.London might develop into an even bigger city D.Londoners would be rid of poverty
单选题Which of the following questions is answered according to the information given in the passage?AWhat is the toxin used by the fish killer?BWho first discovered the organism?CHow does the fish killer paralyze fish?DHow many fishes can the organism kill each day?
单选题Advertisement: The most flavorful olives in the world are kalamata olives. The more kalamata olives used to make a bottle of olive oil, the more flavorful the oil, and no company buys more kalamata olives than Zorba’s Olive Oil. Therefore, when you buy Zorba’s Olive Oil, you’re buying the most flavorful olive oil available today. The reasoning presented in the advertisement is flawed because it overlooks the possibility that:ANot all of Zorba’s competitors use kalamata olives in their oil.BZorba’s sells more olive oil than any other company.CThe most flavorful olive oil is not necessarily the best olive oil.DBecause of bulk discounts, Zorba’s pays less per kilogram of kalamata olives than does its competitors.EThe number of kalamata olives harvested every year is far less than the number of Spanish olives harvested every year.
单选题Which one of the following most seriously undermines the conclusion of this argument?AThe increasing amount of recycled material made available each year is equal to one-tenth of the increasing amount of natural material consumed annually.BRecent studies have shown that the number of endangered animals throughout the world fluctuates sharply and is chiefly determined by changes in meteorological conditions.CThe logging industry contributes huge sums of money to political campaigns instates where it has a financial interest.DThe techniques that make recycling possible are constantly improved so that more is reclaimed for lower costs each year.EPolitical contributions by the recycling industry are now greater than those of either the logging or animal protection interests.
单选题In fisheries in general, when a large harvest is taken one year, there will be fewer fish available to be harvested in the following year, leading to decreasing yields of most fish species over time. The Maine lobster is an anomaly, however. Even though the vast number of lobster traps covering the New England coast pull in more lobsters every year, the number of lobsters in the water has shown no signs of decreasing.Which of the following, if true, most helps to explain the apparent anomaly concerning the number of Maine lobsters?AThe decline of other fish species in the region has deprived the lobster of its natural food source of scavenged fish.BThe bait in lobster traps provides abundant food for young lobsters, which are still small enough to swith out of the traps, leading to much higher survival rates among young lobsters than would be expected in nature.CAs global warming heats the waters of the Atlantic coastline, the Maine lobster has extended its northern range to well past Nova Scotia.DThe ever increasing demand for lobsters in seafood restaurants and steakhouses across the country has driven a corresponding increase in the supply of the product.EThe increased lobster harvest has resulted in many iuvenile lobsters but very few breeding- age lobsters, which could result in a crash in lobster numbers in the near future.
单选题Which of the following statements is NOT true according to the passage?AOver 30 oil workers have been kidnapped this year in the Niger Delta region.BA group calling itself the Movement for the Niger Delta People has claimed responsibility for the current reported kidnapping.CThe last kidnapping occurred last week when a German oil worker was taken away.DNigeria produces the most crude oil in Africa.
单选题Because of the good harvest, India had a large（）of wheat that year.AdonationBsupplementCbarnDsurplus
单选题Which of the following statements is true?AScientists have solved the mystery about the fish killer.BMore studies need to be made about the fish killer.CIt is proved that the algae are reducing fish populations.DHumans have already been affected by the toxin.
单选题Although many people would not believe it, the mosquito is actually the most dangerous animal in Africa. While the bite of the black mamba is invariably lethal when untreated, this dreaded snake kills only a few dozen people per year. Hippopotami, with their immense strength and foul dispositions, kill hundreds of people per year in rivers and lakes, but the mosquito is still more dangerous. Mosquitoes bite hundreds of millions of people in Africa every year, and they infect over a million each year with malaria, a disease that is often fatal. Which of the following questions would be most useful in evaluating the claim made above regarding the mosquito?ACould a person survive an attack by a black mamba if that person received prompt medical attention?BWhat criteria are used to determine which animal is the “most dangerous” animal?CCould the incidence of mosquito bites be decreased through the judicious use of pesticides and insect repellent?DDoes malaria kill more people per year in Africa than tuberculosis?EHow does the percentage of people who survive hippopotamus attacks in Africa each year compare with the percentage of people who survive mosquito bites?
单选题Which of the following statements is not mentioned as serious consequences of coral loss?AA reduction in tourism.BIncreased coastal damage from hurricanes.CThe extinction of the estimated 1 million species of fish.DThe collapse of reef fisheries.