2. 外语
  3. Migraine, the most debilitating common form of headache, afflicts perhaps 18 million Americans, who collectively lose 64 million

Migraine, the most debilitating common form of headache, afflicts perhaps 18 million Americans, who collectively lose 64 million

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问题 Migraine, the most debilitating common form of headache, afflicts perhaps 18 million Americans, who collectively lose 64 million workdays a year, and they cost the nation $50 billion in medical expenses and lost work time.
选项 A、a year, and they cost the nation $50 billion in medical expenses and lost
B、a year and thus cost the nation $50 billion in medical expenses and lost
C、a year, so as to cost the nation $50 billion in medical expenses and lost
D、a year that costs the nation $50 billion in lost medical expenses and
E、a year, which thus cost the nation $50 billion in lost medical expenses and
答案B
解析 由题意知，cost和lose是定语从句中的并列谓语动词；A中they的出现不仅多余，且改变了句子的结构，句意随之改变。C中so as to的目的状语与主句之间用逗号隔开是不允许的，且so as to表目的，与句意不符。D中有两个缺陷：(1)cost的原动作执行者本是Americans，现在却变成了a year，改变了句意(逻辑搭配也不当)；(2)lost本用于修饰worktime却改为修饰medical expense，也改变了句意。E中同样有两个缺陷，(1)cost的动作执行者变成了64 million workdays；(2)同D(2)。B正确，大意是：从整体上讲，这些美国人一年要损失掉64 million个工作日，若以医疗费用和损失工作时间计价，他们花去了这个国家500亿美元。
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