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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 ¡¾1¡¿ (freeze) Arctic sea ice. Nature has prepared them for the cold conditions but nothing has prepared them for the danger ¡¾2¡¿ threatens(Íþв) their only home.

The polar bears¡¯ world is melting. Polar bears ¡¾3¡¿ (suffer) in a warmer world are in danger. Studies show that the polar ice ¡¾4¡¿ (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 ¡¾5¡¿ (survive). ¡°The sea ice is more than just the platform that the bears walk ¡¾6¡¿ ,¡± says Andrew Derocher, who studies North American polar bear populations. ¡°Without ¡¾7¡¿ , they can¡¯t exist.¡±

Some melting and refreezing of the polar ice is natural. But in a ¡¾8¡¿ (warm) world, these cycles speed up, and bears have less time to hunt. ¡¾9¡¿ (normal), they have three months in the spring when they gain more weight and the extra fat is used later, ¡¾10¡¿ the bears are not actively hunting. Therefore, it is urgent to protect the environment and maintain the ecological balance.

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¡¾ÌâÄ¿¡¿Once£¬a rabbit built a fantastic warren(´óÔÓÔº)£®He____very happily there.He had designed it so well that£¬____a great rainstorm arrived£¬which flooded nearly the whole wood£¬and the homes of many animals£¬his____untouched.

Soon£¬one after another£¬the____animals came to his door£¬asking if they could spend that___with him in his warren.He__each visitor in£¬and the warren filled up____until there was no room left.This discomfort didn't____the rabbit£¬because he felt he was being generous.

One day in spring£¬when all the animals had returned to their____homes£¬the rabbit was hopping along so absentmindedly that he didn't___that a lynx(ɽè)was lying in wait for him.__ __of the animals who had spent the winter in the rabbit's warren saw this£¬and warned the rabbit of the danger____in time.He offered a warm invitation to the rabbit to live in his home with him___.

The lynx destroyed that home£¬____the rabbit managed to escape and run to hide in the home of____friend.For a whole day£¬the lynx____the rabbit from cave to cave£»but the rabbit___managed to save his skin£¬helped all the time by the friends he had offered shelter to in the winter.

He felt very____£¬not only for having escaped the lynx£¬but also____having made so many friends in the forest£¬thanks to his own____to others.In his life he always tried his best to offer kindness to anyone in trouble.

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