【題目】______ 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】

考查讓步狀語從句。句意:雖然較大的塑料對環(huán)境的影響已有詳細(xì)記錄,但對于微塑料的危害卻知之甚少。A. While 盡管;B. As由于;C. Because因?yàn)椋?/span>D. If如果。此處是while“盡管引導(dǎo)的讓步狀語從句。故選A。

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