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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(Íþв) their only home.

The polar bears¡¯ world is melting. Polar bears 3 (suffer) in a warmer world are in danger. Studies show that the polar ice 4 (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 5 (survive). £¢The sea ice is more than just the platform that the bears walk 6 ,£¢ says Andrew Derocher, who studies North American polar bear populations. £¢Without 7 , they can¡¯t exist.£¢

Some melting and refreezing of the polar ice is natural. But in a 8 (warm) world, these cycles speed up, and bears have less time to hunt. 9 (normal), they have three months in the spring when they gain more weight and the extra fat is used later, 10 the bears are not actively hunting. Therefore, it is urgent to protect the environment and maintain the ecological balance.

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