A. to lose B. being lost C. losing D. to have lost

　　反思巩固：

　　Keys to the Exercise

　　II.习题精选

　　1－5 DAACB 6－10BCAAD 11－15ACBBD

　　III.完形填空

　　1-5 DADBB 6-10 BDADC 11-15BCDCB 16-20 BDADC

　　 1. accept...as(to be)... 把...当作...;认为...是... 由上句unusual 可知为normal

　　 2. For example, Government workers in Washington, D. C. frequently work sixty to seventy hours a

　　 week.举例说明上句.

　　 3. 没人逼迫他们,是他们自己想这样.

　　 4. serious adj. 严肃的,认真的,严重的.废寝忘食工作有时会是一个严重的问题.

　　 5. that is, they might not enjoy movies, sports, ou other types of entertainment. 由句 中 的might 可知,这

　　 些人或许不知道怎样放松.

　　 8. Heart attacks and stomach diseases are physical ones.

　　 9. besides adv. 此外;而且 eg: I don't want to come out now, and besides, I must work.