The population density per square mile in the United States is twenty-two people, while that in Canada is two people. A. whereas B. when C. however D. and (TOEFL)
句中的 while 是否可用 when 来代替?
while 与 when 用法上的一个重要区别, 就是 while 可用于表示对比 (whereas), 而 when 却没有这个用法。
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Jane was dressed in brown while Mary was dressed in blue. (ALD) 简穿褐色衣服, 而玛丽却穿蓝色衣服。
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While their country has plenty of oil, ours has none. (LDCE) 他们国家有充足的石油，而我们国家却没有。
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Every knight was on his back, but three of the knights had their legs extended straight out while two had their legs crossed. (Dan Brown, The Da Vinci Code) 每个骑士都仰面躺着，但有三位骑士将双腿伸得笔直，而其他两名骑士则将腿并拢起来。（《达·芬奇密码》）
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I felt excited yet apprehensive, well aware that a rousing speech was one thing while designing and passing legislation was another. (Hillary, Living History) 我很兴奋，但不无忧虑，我清楚地知道：振奋人心的演讲是一回事，设计和通过立法则是另一回事。
请做下面的英语试题：
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I'd like to study law at university ____ my cousin prefers geography. A. though B. as C. while D. for(全国高考四川卷,07-29)
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In some places women are expected to earn money ____ men work at home and raise their children. A. but B. while C. because D. though(全国高考四川卷,08-12)