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  3. The finding that there were rock-melting temperatures on asteroids for sustained periods is puzzling: asteroids’ heat source is

The finding that there were rock-melting temperatures on asteroids for sustained periods is puzzling: asteroids’ heat source is

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问题     The finding that there were rock-melting temperatures on asteroids for sustained periods is puzzling: asteroids’ heat source is unknown, and unlike planet-sized bodies, such small bodies quickly dissipate heat. Rubin suggests that asteroids’ heat could have derived from collisions between asteroids. Skeptics have argued that a single impact would raise an asteroid’s overall temperature very little and that asteroids would cool too quickly between impacts to accumulate much heat. However, these objections assumed that asteroids are dense, solid bodies. A recent discovery that asteroids are highly porous makes Rubin’s hypothesis more plausible. When solid bodies collide, much debris is ejected, dissipating energy. Impacts on porous bodies generate less debris, so more energy goes into producing heat. Heat could be retained as debris fall back into impact craters, creating an insulating blanket.
It can be inferred from the passage that Rubin disagrees with skeptics mentioned in the passage about which of the following?
选项 A、Whether porous bodies generate less debris when struck than do solid bodies
B、The temperatures asteroids would have to reach for their rocks to have melted
C、The likely effect of impacts on asteroids’ temperatures
答案C
解析 本题的核心在于找到鲁宾和怀疑者的观点之间的差异。鲁宾认为小行星靠撞击就可以产生高温，但是怀疑者不这么认为，因此选项C正确。A项如果选择选项A，就意味着怀疑者也讨论了多孔天体的碎片。但是根据文章可知，怀疑者根本没有想过小行星是多孔的，因此排除。B项鲁宾和怀疑者都在讨论小行星是如何达到这么高的温度的，因此温度不可能是两个人观点的差异之处。
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本试题收录于： GRE VERBAL题库GRE分类
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