2. 外语
  3. People who inherit the sickle cell anemia gene from only one parent seem to be resistant to malaria, an evolutionary advantage t

People who inherit the sickle cell anemia gene from only one parent seem to be resistant to malaria, an evolutionary advantage t

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问题 People who inherit the sickle cell anemia gene from only one parent seem to be resistant to malaria, an evolutionary advantage that may explain why a genetic condition so debilitating to many individuals has survived in the human population.
选项 A、seem to be resistant to malaria
B、seemingly are resistant to malaria
C、seem to be resistant to malaria and have
D、seemingly are resistant to malaria and to have
E、are, it seems, resistant to malaria, and they have
答案A
解析 B、D中seemingly的位置是不恰当的，应放到are之后；C、E中：把一个动作分割成了两个动作seem and have从而使句意更加复杂化，而且不可理解；A为答案，其中：anevolutionary advantage指前面的(the ability)to be resistant to malaria，后面的that从句对此“进化优势”进行补充说明；在这里，采用直接的定语从句会导致先行词的不确定性，(因为which不可指前面的句子)；而通过这样一个an evolutionary advantage的过渡，使得用定语从句进行修饰限定成为可能且不会造成歧义。
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