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678. 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.
A. Mars would have to endure low levels of gravity for long peri ods of time, avoiding large doses of radiation, plus contending
B. Mars would have to endure low levels of gravity for long periods of time, avoid large doses of radiation, contend
C. Mars, having to endure low levels of gravity for long periods of time, would also have to avoid large doses of radiation, plus contending
D. Mars, having to endure low levels of gravity for long periods of time, avoid large doses of radiation, plus contend
E. Mars, who would have to endure low levels of gravity for long periods of time, avoid large doses of radiation, contend with
这道题考察的是and平行
And后面的平行对象是ward off，and前面的平行对象是endure，avoid，contend
A选项错了，A选项中avoiding，contending是修饰，修饰前面的动作，语义不符。
B选项正确。
C, D选项和A选项类似。
E选项中who引导一个从句修饰前面的Travelers，这句话本身没有问题，但是它改变了原文的逻辑重心，如果原文逻辑正确，我们首选遵从原文，所以E选项不能选。
答案选B
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