【问】 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，90. 8)
 坦白地说，这道题把我难倒了。
 【答】 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(助动词或联系动词与主语倒装)。例如：
 1. Students with strong motivation are more likely to succeed than are those with poor mo-tivation. (IME)
 动机强的学生比动机差的学生较可能获得成功。
 2. Oil costs less than would atomic energy. (CGEL)
 石油比原子能成本低。
 3. I spend more than do my friends. (CGEL)
 我花的钱比朋友们花的多。
 4. Results showed that the subjects in the beautiful room tended to give higher ratings tothe 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。
 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：
 1. 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，92.8)
 2. Western Nebraska generally receives less snow than____Eastern Nebraska.
 A. does B. in C. it does in D. in it does(TOEFL，82. 8)
 3. 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，84. 11)
 4. 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)