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16.这是人类首次认真思考自己的活动对环境造成的影响.(It's the first time; effect)It is the first time (that) humans/human beings have thought seriously about the effect of their activities on the environment.

分析 这是人类首次认真思考自己的活动对环境造成的影响.

解答 答案:It is the first time (that) humans/human beings have thought seriously about the effect of their activities on the environment.
解析:It is the first time (that)这个结构中,that从句要用现在完成时(如果是it was the first time that,则that从句要用过去完成时);另外本题还考查the effect on"对…造成的影响"这一固定短语.

点评 本题考查句子翻译,做此类题目时一定要根据中文及英文题干确定需要翻译的成分,再找出与之对应的英文并考虑各成分是否有形式的改变.

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