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

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

D


解析:

feasible(=that can be done)可行的,可做到的:1)Your plan sounds quite feasible.(你的计划听起来很可行。) 2)It's not feasible to make the trip in one day.(一天内要进行这次旅行是做不到的。)obtainable可得到的;considerable相当的,可观的;potential潜在的,可能的。

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