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题型:阅读理解-阅读单选 难度:0.65 引用次数:136 题号:19436227

The heating of the planet is pushing Earth’s polar bear population to its limit, and according to a new study, they could have fewer than 100 years left before extinction.

The polar bears live by hunting seals in the Arctic Ocean, but as more and more ice melts (融化) in that region, their habitat continues to reduce. Since amounts began to be measured at the end of the 1970s, sea ice that lasts for more than a year in the Arctic has decreased at a rate of 13% per decade.

Studies have long shown that declining sea ice will lead to a decline in polar bears, but new research published in Nature Climate Change models a specific doomsday (世界末日) timeline. Polar bears will be unable to endure the effects of climate change over the next several decades, the scientists believe, and will be wiped out by 2100.

“What we’ve shown is that, first, we’ll lose the survival of cubs (幼崽), so cubs will be born, but the females won’t have enough body fat to produce milk to bring them along through the ice-free season, said Dr. Steven Amstrup, chief scientist of Polar Bears

International, to the BBC. “Any of us know that we can only go without-food for so long. That’s a biological reality for all species.”

The study estimated that, even in a situation where countries achieve a moderate (适中的) reduction in greenhouse gases, several populations of polar bears will disappear. But Amstrup emphasized that the animal can still persist (坚持) if climate change does not continue.

“Showing how imminent (迫在眉睫的) the threat is for different polar bear populations-is-another reminder that we must act now to head off the worst of future problems faced by us all,” he said. “The course we’re on now is not a good one, but if society gets its act together, we have time to save polar bears. And if we do, we will benefit the rest of life on Earth, including ourselves.”

1. In writing Paragraph 1, the author aims to________.
A.present an argumentB.make a comparison
C.propose a definitionD.introduce a topic
2. What could we learn from Paragraph 2?
A.Seals hunt polar bears for food.
B.The sea ice has decreased by 13% in a year.
C.Polar bears depend on sea ice for their survival.
D.More and more seals are leaving the Arctic Ocean.
3. What could be inferred from Paragraphs 3 and 4 about the effect of climate change?
A.Sea ice will be wiped out by 2100.
B.The doomsday for mankind is coming.
C.Newborn bears will starve to death in the coming decades.
D.Polar bears will eventually be able to survive without sea ice.
4. By saying “if we do, we will benefit the rest of life on Earth, including ourselves.” in the last paragraph, the author means________.
A.we must act now to save ourselves
B.reducing greenhouse gases is good for all living things on Earth
C.the polar bear population is an imminent threat and we must take action
D.we should stay on our current course for the survival of all living things
5. What is the passage mainly about?
A.How do polar bears survive?
B.Arctic sea ice is melting at an accelerating rate.
C.Polar bears and humans should coexist in harmony.
D.Polar bears could be extinct by end of the century.

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【推荐1】One night, Pilar was in a deep sleep when she was woken by her cat Inti. Inti was meowing wildly outside Pilar’s bedroom and throwing himself against the closed bedroom door. When Pilar opened her eyes, she saw that her bedroom was filled with smoke. As she escaped her house with Inti in her arms, she saw that a fire was burning in her kitchen. Pilar could easily have lost her life, but Inti would not let that happen. Even though Inti could have escaped the house through a cat door, he wouldn’t leave Pilar.

As amazing as this story is, it is not as uncommon as you may think. Take the example of Charlotte Lee and her horse, Thunder. One summer night, the whole family was asleep with the windows open. It was normally very quiet where they lived. Suddenly, there was a loud noise. Charlotte woke up from her sweet dream, and the noise continued. Then she heard a horse running fast towards the house. The next thing she saw was Thunder standing outside her window, neighing(嘶叫) and shaking his head. She knew something was wrong. Charlotte quickly got everyone out of the house before the earthquake hit. Thunder has saved her life.

There are also stories of wild animals coming to the rescue of humans. One animal known to be a friend of humans is the dolphin. Once, Todd Endris was surfing with his friends when he was attacked by a 13-foot(4-meter) shark. In the middle of the attack, a group of dolphins came to his rescue by forming a protective ring around Endris until he could get safely to shore. Without the help of the dolphins, there is little chance that Todd could have escaped.

No one is sure why animals have so often come to our rescue. However, it is clear that humans and animals enjoy a close relationship. It is important that we care for them as much as we can.

1. Why did Inti throw himself against the door? Because_____.
A.he wanted to get out of the room
B.he was trying to wake up his owner
C.he couldn’t find the way out because of smoke
D.he felt bored and was playing by himself
2. Before the earthquake hit, Charlotte_____.
A.closed the windowsB.ran to warn her neighbors
C.got her horse out of the stableD.was sleeping deeply
3. Both Inti and Thunder_____.
A.saved their owners several timesB.used to make noise at night
C.were shy and quietD.were brave, smart and devoted
4. What might Todd say to those dolphins?
A.Thank you so much.B.What are you doing here.
C.Why are you leaving.D.Leave me alone.
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【推荐2】Without plants, people couldn’t live. We eat plants.     1    . And we need plants for another reason: We need them because they are beautiful.
    2    . Imagine no flowers with their sweet smells, their beautiful colours and their lovely shapes. Imagine, when the wind blows, we are not able to hear the leaves of the trees or watch the branches swing from side to side.
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名校

【推荐3】The desert tortoise is found in the Mojave and Sonoran Deserts in North America. It is listed as an endangered species under the United States federal Endangered Species Act and is considered “vulnerable” by the International Union for Conservation of Nature(IUCN). Despite the laws that protect them,their numbers are still in the decline.

The desert tortoise in the areas has lived for thousands of years. This animal is able to survive ground temperature over 140 degrees F and is known to 1ive as long as 60 to 80 years. However, ninety-five percent of the life of a desert tortoise is spent in the ground escaping the heat in a hole or passage in the ground. Holes can be easily destroyed by off-highway vehicles that do not stay on built roads. Disasters also occur when they seek shade under parked cars.

Desert tortoises are also harmed by several diseases such as the upper respiratory tract disease often found in adopted (领养) tortoises. Pet owners putting sick tortoises into the wild has resulted in diseases being spread to wild tortoises.

The desert tortoise feeds on a dune primrose (报春花) during spring. Non-native Sahara mustard (芥菜) seen in the background is a weed that competes with the native plants for water and nutrients. In some areas, mustard grows so thickly that it is nearly impossible for desert tortoises to pass through. Vehicles, which do not stay on built roads and do not get washed frequently, contribute to spreading weeds.

Rubbish, such as burst balloon, is a danger to desert tortoises. The balloon can be mistaken for food by desert tortoises and, once eaten, may remain in the stomachs and intestines (肠) giving them a false sense of fullness that may cause them to starve.

1. What does the underlined word “vulnerable” in Paragraph 1 refer to?
A.hardly noticed.B.well protected.
C.easily harmed.D.very useful.
2. Why does the desert tortoise spend most of its time underground?
A.To escape cross-country vehicles.B.To protect them from the heat.
C.To save energy for a long life.D.To shelter them from other animals.
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