Hot objects emit ____ do cold objects. A. rays more than infrared B. rays are more infrared than C. more than infrared rays D. more infrared rays than (TOEFL) 坦白地说,这道题把我难倒了。
要做这道题,必须明确:than 从句的主语和谓语常常需要实行部分倒装(助动词或连系动词与主语倒装)。实行部分倒装的原因之一,就是 than 从句的主语较长,如不倒装就会显得头重脚轻。例如:
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Students with strong motivation are more likely to succeed than are those with poor motivation. (IME) 动机强的学生比动机差的学生较可能获得成功。
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Oil costs less than would atomic energy. (CGEL) 石油比原子能成本低。
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I spend more than do my friends. (CGEL) 我花的钱比朋友们花的多。
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Results showed that the subjects in the beautiful room tended to give higher ratings to the faces than did those in the ugly room. (RC) 实验结果表明,漂亮房间里的受试者给照片上的面孔打的分数往往比丑陋房间里的受试者打的分数高。
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By then I had become accustomed to the constant presence of security, to having intimate conversations within earshot of Secret Service men and women who I sometimes thought knew more about me and my family than did my closest friends. (Hillary, Living History) 当时我已习惯随时有安全人员在场，有特工处男女干员附耳说悄悄话，有时我还认为他们比我最亲密的友人还了解我与我的家人。(希拉里，《亲历历史》)
考生应记住,上面的语法规则是托福等标准英语考试常常考核的项目:
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Probably no man had more effect on the daily lives of most people in the United States ____ Henry Ford, a pioneer in automobile production. A. as was B. than was C. than did D. as did(TOEFL)
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Western Nebraska generally receives less snow than ____ Eastern Nebraska. A. does B. in C. it does in D. in it does (TOEFL)
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Liberals tend to favor ____ do conservatives. A. more than immediate social change B. change more immediate than social C. more immediate social change than D. social change more than immediate(TOEFL)
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He often sat in a small bar, drinking and smoking considerably more ____.
A. than is good for his health B. than his health
C. than that he is healthy D. than good health(大学生英语竞赛题)