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【題目】During the early ____________of planetary evolution, they served to sweep the solar system.

A.stagesB.journeysC.speciesD.demands

【答案】A

【解析】

考查名詞詞義辨析。句意:在行星演化的早期,他們用來清掃太陽系。A. stages階段;B. journeys旅程;C. species物種;D. demands要求。根據planetary evolution可知,此處用“階段”符合語境,故選A項。

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