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【题目】______ the environmental impacts of larger plastics are well documented, very little is understood about the dangers associated with micro plastics.

A.WhileB.AsC.BecauseD.If

【答案】A

【解析】

考查让步状语从句。句意:虽然较大的塑料对环境的影响已有详细记录,但对于微塑料的危害却知之甚少。A. While 尽管;B. As由于;C. Because因为;D. If如果。此处是while“尽管引导的让步状语从句。故选A

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