填空题

Frogs and toads are usually poisonous.

【参考答案】

N
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试分析五十年后世界上可能出现的重大问题,内容应包括: 1.描述一下当前的隐患; 2.未来问题的出现形式及其严重性; 3.提供解决问题的可行性方案。 What do you think will be the world’s greatest problem in fifty years time
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The frogs’ natural habitat is becoming more and more developed.
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