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题型:阅读理解-阅读单选 难度:0.65 引用次数:257 题号:12160053

We all love animals, but animals don’t feel the same way about us. When we enter their wild world, we are “unnatural” invaders into their homes.

There was a video many of you may have seen on the Internet recently of a bear and its cub (幼崽) climbing up a steep, snow-covered hill in Russia. The mama bear makes it to the top without too much trouble, but the baby bear keeps sliding back down. It takes three attempts to reach the top and, no doubt, many cheered at the cub’s never-give-up spirit. But nature scientists who saw the video didn’t cheer.

Instead, the scientists were upset that the two bears had been frightened into making a dangerous, unnecessary climb by the drone (无人机) that was filming them. Sophie Gilbert of the University of Idaho said, “It showed a complete lack of understanding from the drone operator of the effects his actions were having on the bears.” Other scientists have found that when a drone is hovering near, a bear’s heart rate can increase from 41 beats per minute to 162 beats per minute — a high enough rate to cause a heart attack.

Human disturbance has actually been having a far-reaching influence on wildlife. Researchers at the University of Berkeley recently found that many mammals are turning into “night owls” again to avoid contact with humans. Such a shift might not only affect those species themselves, but also have numerous chain effects.

We human beings find ourselves in a strange position in nature. We are part of it but also separate from it, now more than ever, since most of us live in cities. So, when we go off hiking into wild areas to “re-connect” with nature, we should go softly and considerately. It’s OK to get close to our animal friends, just not too close — we wouldn’t want to scare them, would we?

1. What does the video feature?
A.The baby bear’s climbing.B.The mama bear’s care.
C.The dangerous environment.D.The experiment by scientists.
2. Why didn’t nature scientists cheer?
A.They knew the bear’s family well.
B.They were against other scientists.
C.They knew the cause of the bears’ climbing.
D.They lacked understanding of the drone operator.
3. What may be the effect of human disturbance on wildlife?
A.Food shortage.B.Changing habitats.
C.Ecological imbalance.D.Less contact with humans.
4. What does the author seem to agree with?
A.Lose connection with nature.
B.Tighten the bond with wild animals.
C.Respect the human-animal distance.
D.Shoot more videos on animals for study.

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【推荐1】Insects are to the animal kingdom what the deep sea is to Earth, We think because we know the birds and the mammals so we've already discovered what's on this planet. In fact, we've just scratched the surface.

The Smithsonian Institution says that "there are more insect species that have not been described(named by science)than there are insect species that have been previously named. "Flies are particularly diverse: more than 124,000 species have been identified, but scientists suspect countless more are awaiting discovery.

The Amazon is home to at least 10 percent of the world's known biodiversity and hundreds of thousands of insect species. But it's an uncertain time for the rainforest and for insects.

A 2019 study suggested that about a third of insect species would be vulnerable to extinction in the next few decades, a result of habitat loss from intensive agriculture, pesticide and fertilizer pollution, and climate change, among other factors. And in Brazil, President Jair Bolsonaro has been actively promoting development of the Amazon, more than 300,000 square miles of which has been lost to industry since the 1970s.

Although it's common for scientists to find new insects in the Amazon, the number of unfamiliar fly species caught in the tower traps of insects was surprising. Moreover, many species appeared only in traps set above the ground level. Almost two-thirds of fly diversity is present in the 8- to 32-meter traps, but not in the soil. That means quite a lot of loss when big trees are cut down.

Many of the mystery flies seemed to be phorids(蚤蝇), creatures the size of a few grains of salt, some of which lay their eggs in bees, ants, and other insects.

Brown, one of the world's leading experts on the family Phoridae, knew he needed to see these new phorid species in the wild for himself—and as quickly as possible. "I always feel like we're one farmer and a machete(大砍刀)away from losing a whole bunch of species," he said.

1. What does the underlined sentence in Paragraph 1 mean?
A.Insects are mysterious creatures.
B.Insects are largely unknown to scientists.
C.Insects are significant to the animal kingdom.
D.Insects are hard to study because they are small.
2. From the passage, the author may agree that ________.
A.many of the mystery flies are of small size
B.the vast majority of insects prefer to inhabit in the soil
C.the Amazon is the biggest and safest habitat of insect species
D.we learned as much about insects as about birds and mammals
3. For Brown, what will most probably cause the extinction of insect species?
A.Intensive agriculture.B.Pesticide use.
C.Fertilizer pollution.D.Climate change.
4. Where's the passage most likely from?
A.USA Today.B.The Economist.
C.National Geographic.D.The Fall Street Journal.
2021-05-29更新 | 65次组卷
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【推荐2】For more than 100 million years sea turtles (海龟) have covered huge distances across the world’s oceans, making them among the oldest creatures on the planet. However, they are on the list of endangered species.

Different from some animals like snakes, the sex of the baby sea turtles, called hatchlings , is determined by the environment after fertilization (受精). The temperature of the eggs during a certain period of development is the deciding factor in determining sex, and small changes in temperature can cause very big changes in the sex ratio (比例). Often, eggs at low temperatures (22—27℃) produce males, while eggs at higher temperatures (30℃ and above) produce females. At temperatures in 29℃, which is good for a balanced sex ratio of turtle hatchlings. If temperature reaches 36℃, no hatchlings will be produced.

Climate change has a powerful effect on turtle nesting (筑巢) sites. It changes sand temperatures, which then affects the sex of the hatchlings. Scientists have found that unusually warm temperatures caused by climate change are upsetting the normal ratios, resulting in fewer male hatchlings. The past four hottest summers in Florida have seen only female sea turtles. And an Australian study has shown a similar effect in which 99% of the hatchlings are female.

In addition to rising temperatures, turtles are also facing the threat of too much plastic in the oceans, along with a number of other threats. “Plastic pollution is a problem for turtles as they can mistake plastics for food easily. Even a single piece of plastic can kill a turtle,” Dr Couper, working at the Queensland Museum, said. “We have collected some plastics taken from turtles’ stomachs to show people what kinds of things are showing up on beaches. I want it to be an eye opener.”

1. Which temperature is good for a balanced sex ratio of turtle hatchlings?
A.26℃.B.29℃.C.31℃.D.36℃.
2. What can be inferred from paragraph 3?
A.Sea turtles will build their nesting sites elsewhere.
B.Global warming is an extreme threat to sea turtles.
C.Global warming is much more obvious in Australia.
D.Over 90% of the turtle hatchlings are female globally.
3. What does Dr. Couper intend to say?
A.Turtles do not have enough sources.
B.Turtles do not have a good sense of smell.
C.People should clean up beaches more often.
D.People should raise environmental awareness.
4. In addition to rising temperatures, what threats are turtles facing ?
A.Turtles are also facing the threat of too much plastic in the oceans, along with a number of other threats.
B.Turtles are also facing the threat of hunting.
C.Turtles are also facing the threat of losing living places.
D.Turtles are also facing the threat of hunger.
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【推荐3】With only about 1,000 pandas left in the world, China is desperately trying to clone the animal and save the endangered species. That’s a move similar to what Texas A & M University researchers have been undertaking for the past five years in a project called Noah’s Ark.

Noah’s Ark is aimed at collecting eggs, embryos(胚胎), semen and DNA of endangered animals and storing them in liquid nitrogen. If certain species should become extinct, Dr. Duane Kraemer, a professor in Texas A & M’s College of Veterinary Medicine, says there would be enough of the basic building blocks to reintroduce the species in the future.

It is estimated that as many as 2,000 species of mammals, birds, reptiles will become extinct in over 100 years. The panda, native only to China, is in danger of becoming extinct in the next 25 years.

This week, Chinese scientists said they grew an embryo by introducing cells from a dead female panda into the egg cells of a Japanese white rabbit. They are now trying to implant the embryo into a host animal. The entire procedure could take from three to five years to complete.

“The nuclear transfer(核子移植) of one species to another is not easy, and the lack of available panda eggs could be a major problem,” Kraemer believes. “They will probably have to do several hundred transfers to result in one pregnancy. It takes a long time and it’s difficult, but this could be groundbreaking science if it works. They are certainly not putting any live pandas at risk, so it is worth the effort,” adds Kraemer, who is one of the leaders of the Project at Texas A & M, the first-ever attempt at cloning a dog.

“They are trying to do something that’s never been done, and this is very similar to our work in Noah’s Ark. We’re both trying to save animals that face extinction. I certainly appreciate their effort and there’s a lot we can learn from what they are attempting to do. It’s a research that is very much needed.”

1. What is the aim of Noah’s Ark project?
A.To save endangered animals from dying out.
B.To make efforts to clone the endangered pandas.
C.To collect DNA of endangered animals to study.
D.To transfer the nuclear of one animal to another.
2. According to Professor Kraemer, the major problem in cloning pandas would be short of _________.
A.host animalsB.enough money
C.qualified researchersD.available panda eggs
3. What can we learn from the passage?
A.Scientists try to implant a panda’s egg into a rabbit.
B.Kraemer and his team have succeeded in cloning a dog.
C.Two thousand species will probably die out in over a century.
D.Kraemer will work with Chinese scientists in clone researches.
4. Which can be a suitable title for the passage?
A.China’s Success in Pandas Cloning
B.The First Cloned Panda in the World
C.Exploring the Possibility to Clone Pandas
D.China—the Native Place of Pandas Forever
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