填空题

Human being is the only species that understands the concept of risk, so we can avoid exposing ourselves to real dangers.

【参考答案】

N

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热门试题

填空题

Avian flu killed more people than common flue in the U.S.A to date.

问答题

1. 目前考研究生形成热潮 2．形成这股热潮的原因是什么 3．我的看法