One of the objectives of sending Opportunity and Spirit to Mars is to__________. 查看材料

A.collect
B.develop
C.test
D.look

【参考答案】

D
细节题。题干：发射“机遇号”和“勇气号”漫游车到火星的目标之一是__________。利用题干关键词Oppo......

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