单项选择题

Which of the following statements best describes the organization of the first paragraph

A． A historical theory is sketched and a problem with the theory is cited.
B． Evidence for an objection to a theory is mentioned and a generalization from that evidence is advanced.
C． A paradox about the origins of a historical phenomenon is pointed out and the author's explanation of the paradox is expounded.
D． A statement about a historical phenomenon is offered and a possible misinterpretation of that statement is addressed.
E． A new explanation for a historical phenomenon is given and evidence for that explanation is provided.

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单项选择题

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 the Earth'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.

单项选择题

The passage suggests that which of the following is true concerning the probability that a given collision on Mars would eject fragments that will hit the Earth

A． The probability is higher if the impact produces a crater larger than three kilometers.
B． The probability is lower if the impact produces a crater smaller than three kilometers.
C． The probability is decreased when the impact comes from an area of Mars covered by debris.
D． The probability is decreased when the fragments produced by the impact are larger than 10 centimeters.
E． The probability is decreased when the fragments produced by the impact are younger.