GRE考试

【单选题】Which of the following, if true, would cast most doubt on the conclusions drawn from Head’s higher-resolution models
A、The results of geographical survey prove that no crater larger than twelve kilometers exists on the surface of Mars.
B、Fragments from smaller impact events on Mars are highly unlikely to survive entry through theEarth’s atmosphere.
C、The velocity of rocks escaping from Mat’s gravity is greater when they have been loosened by a large impact.
D、Huge impacts on Mars are proven to be less rare than was previously thought.
E、A、double-succession of large impacts is found to have occurred on Mars in a relatively short period of time.
网考网参考答案：B
网考网解析：
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