With sufficient scientific information a manned trip to Mars should be _____.

A. obtainable    B. potential    C. considerable     D. feasible

D. feasible


解析:

feasible(=that can be done)可行的,可做到的:1)Your plan sounds quite feasible.(你的計(jì)劃聽(tīng)起來(lái)很可行。) 2)It's not feasible to make the trip in one day.(一天內(nèi)要進(jìn)行這次旅行是做不到的。)obtainable可得到的;considerable相當(dāng)?shù),可觀的;potential潛在的,可能的。

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