五、完形填空
Scientists say that most polar bears could disappear by the end of the century because of global warming. According to a study in *Nature Climate Change*, the number of most polar bears will 1 rapidly by 2080. There are 2 reasons. One is that the sea ice is melting. Polar bears catch seals(海豹)to 3 on the ice. 4 ice, they have to stay on land. But there are no 5 food on land to support so many bears. The animals could die from hunger. The other reason is that mother bears may not be fat enough to 6 milk for their babies, so some mother bears could stop 7.
Polar bears are the 8 land animals that eat meat on the planet. They help 9 other kinds of animals. Losing them would break the balance of their living place.
The Arctic(北冰洋)is 10 to about 25,000 polar bears. Arctic sea ice usually melts in spring and summer, and then grows in winter. But now, the 11 is taking longer to grow back. Scientists say that the Arctic is warming twice as 12 as the rest of the planet.
The study also shows 13 it is possible to slow Arctic melting. Greenhouse gas could lead to 14 change. In order to avoid creating greenhouse gas, the world should try to stop burning coal and riding in cars.
Saving the bears is up to us. Holland, one of the writers of the study, says, “I believe there is hope, but humans need to act 15 to make that hope come true.” Let’s take action to protect our earth and save polar bears.
()1. A. develop
B. fall
C. increase
D. improve
()2. A. one
B. two
C. three
D. four
()3. A. play
B. hurt
C. eat
D. remain
()4. A. Without
B. Through
C. Across
D. Except
()5. A. good
B. sweet
C. delicious
D. enough
()6. A. protect
B. progress
C. produce
D. prepare
()7. A. eating food
B. having babies
C. sleeping
D. playing
()8. A. largest
B. loveliest
C. simplest
D. luckiest
()9. A. take
B. control
C. lose
D. get
()10. A. room
B. family
C. house
D. home
()11. A. sea
B. ice
C. plant
D. animal
()12. A. suddenly
B. normally
C. slowly
D. fast
()13. A. that
B. when
C. if
D. whether
()14. A. food
B. life
C. climate
D. planet
()15. A. widely
B. clearly
C. quietly
D. quickly

五、1—5 BBCAD 6—10 CBABD 11—15 BDACD

【解析】
1. 第1空：根据前文“most polar bears could disappear”可知北极熊数量会快速下降，fall表示“下降”，故选B。
2. 第2空：后文提到“One is...The other reason...”，说明有两个原因，故选B。
3. 第3空：北极熊抓海豹是为了食用，eat符合语境，故选C。
4. 第4空：没有冰的话，北极熊只能待在陆地上，Without表示“没有”，故选A。
5. 第5空：陆地上没有足够的食物支撑大量北极熊，enough表示“足够的”，故选D。
6. 第6空：母熊不够胖就无法产奶，produce milk是固定搭配“产奶”，故选C。
7. 第7空：母熊无法产奶，可能会停止生育，having babies表示“生育”，故选B。
8. 第8空：北极熊是地球上最大的陆地食肉动物，largest表示“最大的”，故选A。
9. 第9空：北极熊帮助控制其他动物的数量，维持生态平衡，control表示“控制”，故选B。
10. 第10空：“be home to”是固定搭配，意为“是……的栖息地”，故选D。
11. 第11空：前文提到海冰融化，此处指冰重新形成的时间变长，故选B。
12. 第12空：北极变暖的速度是地球其他地区的两倍快，fast表示“快速地”，故选D。
13. 第13空：此处是that引导的宾语从句，作shows的宾语，故选A。
14. 第14空：温室气体会导致气候变化，climate change是固定搭配“气候变化”，故选C。
15. 第15空：人类需要快速行动来拯救北极熊，quickly表示“快速地”，故选D。
【答案】
1—5 BBCAD 6—10 CBABD 11—15 BDACD
【知识点】
1. 完形填空语境理解
2. 固定搭配运用
3. 词义辨析
【点评】
本文围绕全球变暖导致北极熊濒临灭绝展开，考查学生对语境的理解能力、固定搭配的掌握以及词义辨析能力，同时渗透了环境保护意识，引导人们关注生态平衡。
【难度系数】
0.6