63
(suffer) in a warmer world are in danger. Studies show that the polar ice
64
(reduce) by 9.8% every 10 years since 1978.At present , about 20,000 to 25,000 polar bears live in the Arctic. Polar bears depend on the sea ice for their
65 (survive). “The sea ice is more than just the platform that the bears walk
66
,” says Andrew Derocher, who studies North American polar bear populations. “Without
67
, they can’t exist.”
Some melting and refreezing of the polar ice is natural. But in a
68
(warm) world, these cycles speed up, and bears have less time to hunt.
69
(normal), they have three months in the spring when they gain more weight and the extra fat is used later,
70
the bears are not actively hunting. Therefore, it is urgent to protect the environment and maintain the ecological balance.
3.【四川省资阳市2016届高三上学期第二次诊断】阅读下面材料,在空白处填入适当的内容(1个单词)或括号内单词的正确形式。
One sentence from the news in Washington has remained in my mind since a trip last summer: “When you see people run against the crowd escaping
61
the danger, they are
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