some time.

　　18 . If only the nature of the aging process is better understood, the possibility of discovering a

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　　medicine that can block the fundamental process of aging seems very remote .

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　　19. When I consider how talented he is as a painter, I cannot heip but believing that the public

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　　will appreciate his gift .

　　20. Allen has stated that he has always had a great interest and admiration for the work of the

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　　British economist Keynes .

　　Section C:

　　21. Please do not be ___ by his bad manners since he is merely trying to attract attention.

　　A. disregarded B. distorted C. irritated D. intervened

　　22. Craig assured his boss that he would ___ all his energies in doing this new job.

　　A. call forth B. call at C. call on D. call off

　　23. Too much ___ to X-rays can cause skin burns, cancer or other damage to the body.

　　A. disclosure B. exhibition C. contact D. exposure

　　24. When confronted with such questions, my mind goes ____, and I can hardly remember my own date of birth.

　　A. dim B. blank C. faint D. vain

　　25. It is well known that knowledge is the ____ condition for expansion of mind.

　　A. incompatible B. incredible c. indefinite D. indispensable

　　26. More than two hundred years ago the United States ____ from the British Empire and become an independent country.

　　A. got off B. pulled down C. broke away D. attached to