When a space shuttle has accomplished its _____, it can be ready for another trip in about two weeks.
A．ventureB．missionC．commissionD．responsibility
　B
　　本題譯文：當(dāng)航天飛機(jī)完成了它的使命，它能在大約兩周內(nèi)做好準(zhǔn)備再次航行。mission通常指一種特殊的、特定的且有一定難度的使命或工作，常與accomplish, complete等詞搭配，如：accomplish a historic mission完成一項歷史使命。Venture冒險；常指商業(yè)上的冒險投機(jī)。例如：He declined the business venture. Commission委任；代理；傭金。He often goes beyond his commission.(他時常越權(quán)。)responsibility責(zé)任。
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