11. A large _____ of the sunlight never reaches the earth while infra-red heat given off by the earth is allowed to escape freely.
A. ratio B. proportion C. rate D. fraction
12. It is amusing that she _____ her father’s bad temper as well as her mother’s good looks.
A. inherited B. retained C. preserved D. maintained
13. _____ the few who have failed in their examination, all the other students in the hall are in very high spirits.
A. In spite that B. But for C. Apart from D. For the sake of
14. The decline in moral standards, which has long concerned social analysts, has at last _____ the attention of average Americans.
A. clarified B. cultivated C. characterized D. captured
15. Our neighbor Uncle Johnson is a stubborn man. Needless to say, we tried _____ to make him change his mind.
A. in short B. in secret C. in vain D. in danger

参考答案
11-15 BACDC