Travelers from Earth to Mars would have to endure low levels of gravity for long periods of time, avoiding large doses of radiation, plus contending with the chemically reactive Martian soil, and perhaps even ward off contamination by Martian life-forms.


Mars would have to endure low levels of gravity for long periods of time, avoiding large doses of radiation, plus contending

Mars would have to endure low levels of gravity for long periods of time, avoid large doses of radiation, contend

Mars,having to endure low levels of gravity for long periods of time, would also have to avoid large doses of radiation, plus contending

Mars,having to endure low levels of gravity for long periods of time, avoid large doses of radiation, plus contend

Mars,who would have to endure low levels of gravity for long periods of time, avoid large doses of radiation, contend with

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考题讲解

题目分析：

本题考察了并列句和伴随状语的差别。

从火星到地球的旅行者必须长时间忍受低重力，避免大量辐射，对付化学放射性火星土壤，并且甚至避免来此火星生物的感染。


选项分析：

A选项：

avoid和contend成为了endure的伴随状语，修饰endure。但逻辑上来说，忍受、避免、对抗、避免应该都是travelers要做的几件并列的事情，这几个动作之间没有修饰关系。

B选项：

正确

C选项：

have to endure成为了have to avoid的伴随状语，但这里并没有修饰关系


D选项：

错误原因同C

E选项：

who would have to endure成为了traveler的定语，但应该是travelers并列的去干几件事

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