Some greenhouse gases occur naturally in the atmosphere, while others______(由人类的活动造成).

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问题 Some greenhouse gases occur naturally in the atmosphere, while others______(由人类的活动造成).

选项

答案result from human activities

解析 “由……造成”直接用result from...的主动形式。

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大学英语四级

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Some greenhouse gases occur naturally in the atmosphere, while others______(由人类的活动造成).

大学英语四级

A、Becauseitisagoodexercise.B、Becauseithelpspeopletoloseweight.C、Becausefamouspeoplearedoingit.D、Becauseitte

"Family"isofcourseanelasticword.ButwhenBritishpeoplesaythattheirsocietyisbasedonfamilylife,theyarcthinking

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Newtechnologylinkstheworldasneverbefore.Ourplanetbas【S1】______.It’snowa"globalvillage"wherecountriesareonlys

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