进阶英语听力训练 10 ｜附测试题及答案

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Most polar(北极) bears could disappear 1___ because of global(全球) warming, scientists say.
2___ in Nature
Climate(气候)Change,the number of most polar bears will 3___. There are two reasons. 4___ the sea ice is melting(融化).Polar bears catch seals(海豹)to eat on the ice. 5___,they have to stay on land. But there is 6___ to support so many bears. The animals could die from hunger. 7___ mother bears may not be fat enough to 8___, so some bears could 9___.
Polar bears are the largest land animals that eat meat 10___. They 11___ other kinds of animals. Losing them would 12___.
The Arctic(北冰洋)is 13___ about 25,000 polar bears. Arctic sea ice usually melts in spring and summer, and then grows in winter. But now,the ice 14___.Scientists say the Arctic is warming 15___ the rest of the planets.
The study also shows that 16___ to slow Arctic melting. Greenhouse gas(温室气体)could lead to climate change. In order to 17___ , the world should try to stop burning coal and riding in cars.
Saving the bears 18___.Holland, one of the writers of the study, says,“I believe there is hope,but humans need to act quickly 19___.” Let’s 20___ to protect our earth and save polar bears.
1.by the end of the century
2.According to a study
3.fall rapidly by 2080
4.One is that
5.Without ice
6.no enough food on land
7.The other reason is that
8.produce milk for their babies
9.stop having babies
10.on the planet
11.help control
12.break the balance of their living place
13.the home to
14.is taking longer to grow back
15.twice as fast as
16.it is possible
17.avoid creating greenhouse gas
18.is up to us
19.to make that hope come true
20.take action