Although the hazards of space travel are many, tile rewards made it a worthwhile ______.

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问题 Although the hazards of space travel are many, tile rewards made it a worthwhile ______.

选项 A、endeavor
B、execution
C、expenditure
D、expedition

答案A

解析 逻辑关系题:解释。[A]endeavor“努力,尽力”是对space travel的描述,space travel是一种努力。[B]execution“执行,执行”;[C]expenditure“花费,支出”;[D]expedition“远征,远征队”;这三项都不能使语义通顺。
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