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题型:阅读理解-阅读单选 难度:0.65 引用次数:212 题号:10046073

We've certainly seen a dog nursing a wound, or a deer calling out in pain. But many animals suffer in silence. The most silent sufferers in the animal world may be fish.

Do fish feel pain? A new study from the University of Liverpool has found that fish feel pain in a way that's "strikingly similar" to humans. For the study, Lynne Sneddon, from the university's Institute of Integrative Biology, reviewed the existing body of research 98 studies in all and concluded that they feel pain just as sharply as we do."

When subject to a potentially painful event, fish show changes in behavior such as stopping feeding and reduced activity, which are prevented when a pain-relieving drug is provided. In fact, like us, they breathe heavily and stop eating when they're hurting. They will even rub the part of their body that aches." Sneddon notes in a university release.

To understand pain in other species, scientists look at nociceptors (疼痛感受器), which send signals to the brain when the body is being damaged. Humans have them throughout their skin, bones and muscles. Nociceptors have also been found in many other species, including even those tiny fruit flies.

Fish have the same means to detect pain signals and the equipment to receive them. Besides, the fishermen's opinion that fish feel no pain just doesn't add up from an evolutionary view. Pain is an efficient messenger that tells, us that we've got a problem. An animal that can't feel it won't get that memo (ER), even if it hurts itself.

"If we accept fish experience pain, then this has great significance for how we treat them," Sneddon says. "Care should be taken when handling fish to avoid damaging theirs sensitive skin and they should be humanely caught and killed."

1. What can we learn about fish?
A.They are insensitive to pain.B.They are able to sense pain.
C.They won't react to painkillers.D.Their brain is the first to send pain signals.
2. What will a fish do when its lips get hurt?
A.It might rub its lips.B.It will keep its mouth open.
C.It will swim around like crazy.D.It will keep eating to forget pain.
3. What is the significance of the study according to Sneddon?
A.People will treat fish in a kinder way.
B.People can understand evolution better.
C.People can develop more drugs to save fish.
D.People will think of more ways to catch fish.
4. What does the underlined part "add up" probably mean?
A.Disappear.B.Put forward.
C.Make sense.D.Happen.

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【推荐1】Sharks are now at the edge of extinction. Numbers of oceanic sharks have declined by an alarming 71 percent over the past 50 years, according to research published in Nature on Jan 27. “Such steep declines are shocking even to experts, especially when compared to land animal statistics,” Sonja Fordham at Shark Advocates International, a US-based nonprofit, told New Scientist magazine. This alarming data may be an underestimate of reality due to unreported fish catches, Nathan Pacoureau, the study researcher, noted.

The study analyzed 31 species; 24 now risk extinction, and three shark species are now classified as critically endangered, including the oceanic white-tip shark (远洋白鳍鲨) and great hammerhead (锤头鲨). The study found the decline hit the largest species first before impacting smaller ones over time, according to the International Union for Conservation of Nature (IUCN). It also revealed that shark finning and fishing worldwide have driven the decline. “The Indian Ocean is the worst. There is almost no (fisheries) management at all,” said Pacoureau.

“Overfishing of sharks and rays endangers the health of entire ocean ecosystems as well as food security for some countries,” said Nicholas Dulvy, a professor of Simon Fraser University in British Columbia, Canada. The researchers are calling on immediate action to secure a brighter future for these “extraordinary, irreplaceable animals”, according to the BBC.

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1. What can we know from paragraph 1?
A.Sharks are raised for their meat.B.Sharks are nearly going extinct.
C.Sharks were well protected 50 years ago.D.Human activities will make them extinct quickly.
2. What causes sharks to become fewer mostly?
A.Climate change.B.Water pollution.C.Ocean accidents.D.Fishing pressure.
3. What attitude does the author hold to the sharks’ future?
A.Optimistic.B.Unconcerned.C.Worried.D.Pessimistic.
4. What can be a suitable title for the text?
A.Threat to the Survival of SharksB.Effect of Human Activities on Sharks
C.Research on Extinction of SharksD.Measures to Protect Sharks
2021-06-25更新 | 96次组卷
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【推荐2】Thousands of birds die each spring and fall when they crash with Chicago’s high-rise buildings, which lie on a major migration path between Canada and Latin America. But the birds don’t die in vain. Since the 1970s, many of them have been collected from the street by the city’s Field Museum. They were classified and recorded in detail there. This unique and detailed set of data has been a scientific windfall, showing that North American migratory birds appear to become smaller in size.

A new study of this data has highlighted an important trend: birds that have bigger brains, relative to their body size, are not shrinking as much as the smaller-brained members of their species. The study is the first to identify a potential link between awareness and animal response to human-made climate change, according to the researchers from Washington University in St. Louis. “As temperatures warm, body sizes are decreasing.” said Justin Baldwin. “But larger-brained species are decreasing less strongly than small-brained species.”

Relative brain size is often considered an indicator of behavioral flexibility in birds, according to the research. “The idea is causing a lot of disagreements when it’s applied to some other animals”, Baldwin said, “but it works for birds.” “Relative brain size connects with increased learning ability, increased memory, longer lifespans and others.” Baldwin said. “In this case, a bigger-brained species of bird might be able to reduce its risk to warming temperatures by searching for habitats with cooler temperatures, for example.” he said.

Birds that had big brains, relative to their bodies, had body-size reductions that were only about one-third of those observed for birds with smaller brains, the study found.

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4. How will bigger-brained birds protect themselves from the warming temperatures?
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【推荐3】The giant panda is beloved of conservationists. It is one of the most recognisable large animals in the world. But it is also evolutionarily odd. It is a type of bear but it is a herbivore(食草动物). It is ironic, then, that this icon of the natural world might actually be an accidental consequence of human activity. Yet this is a convincing interpretation of results just published in a paper in Current Biology, by Wei Fuwen of the Institute of Zoology, in Beijing.

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A.Studying the diets of pandas.
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C.Studying the structure of genes of pandas.
D.Analyzing the isotopic composition of pandas’ bones and teeth.
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