【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(lái)清掃太陽(yáng)系。A. stages階段;B. journeys旅程;C. species物種;D. demands要求。根據(jù)planetary evolution可知,此處用“階段”符合語(yǔ)境,故選A項(xiàng)。

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