Question

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

A.stagesB.journeysC.speciesD.demands

Answer 1

【答案】A

【解析】

考查名词词义辨析。句意：在行星演化的早期,他们用来清扫太阳系。A. stages阶段；B. journeys旅程；C. species物种；D. demands要求。根据planetary evolution可知，此处用“阶段”符合语境，故选A项。