With sufficient scientific information a manned trip to Mars should be _____.
A．obtainableB．potentialC．considerableD．feasible
D
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(dāng)?shù)�，可觀的；potential潛在的，可能的。
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