二、短文填词

　　(改编自河北省保定市2016届高三期末调研)Polar bears live in such environment that is too cold for most animals. For much of the year, they live and hunt on the

　　1

　　(freeze)Arctic sea ice. Nature has prepared them for the cold conditions but nothing has prepared them for the danger

　　2

　　threatens their only home.

　　The polar bears’ world is melting. Polar bears

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　　(suffer) in a warmer world are in danger. Studies show that the polar ice

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　　(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

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　　(survive). “The sea ice is more than just the platform that the bears walk

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　　,” says Andrew Derocher, who studies North American polar bear populations. “Without

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　　, they can’t exist.”

　　Some melting and refreezing of the polar ice is natural. But in a

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　　(warm) world, these cycles speed up, and bears have less time to hunt.

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　　(normal), they have three months in the spring when they gain more weight and the extra fat is used later,

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