2. 外语
  3. Doctors still know little about how the Listeria bacterium is spread and why the disease it causes, listeriosis, afflicts some p

Doctors still know little about how the Listeria bacterium is spread and why the disease it causes, listeriosis, afflicts some p

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问题 Doctors still know little about how the Listeria bacterium is spread and why the disease it causes, listeriosis, afflicts some people in a contaminated area though it spares many others.
选项 A、though it spares
B、where it spares
C、despite sparing
D、when sparing
E、while sparing
答案E
解析 在why引导的宾语从句中，根据afflicts some people和spares many others在意思上的对比关系，可以断定B、D无法表达出这种对比关系。对于C，根据GMAT公理，despite之后不跟动名词短语，只跟简单的名词短语，因而C错，同时让步语气不符合句意。A、B有一共同错误：it指代问题。因为在划线部分中的it之前，还出现过一个it，从语法上讲，这两者应指代同一对象，即都应指代the bacterium。但从句意上讲，后一个it应指the disease或listeriosis，二者产生矛盾。E最佳，while sparing的逻辑主语就是disease，同时又表明对比关系。
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