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

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

D


解析:

考查形容詞詞義辨析。feasible可行的，可做到的；obtainable可得到的；     considerable相當?shù)�，可觀的；potential潛在的，可能的。

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