點擊查看》》2021大學英語四級語法詞匯練習及解析匯總

21. The vacuum cleaner is a valuable labor-saving ______ action.

A. device B. engine C. piece D. instrument

22. The flight was postponed because of technical problems and was finally cancelled last week when a ______ was discovered.

A. accident B. defect C. damage D. defeat

23. When she was crossing the road, she was knocked down by a motor-car and lay ______ by the roadside.

A. asleep B. thoughtless C. unconscious D. unaware

24. The novels he has written have shown his ______ ability as an author.

A. literal B. literally C. literature D. literary

25. The reader is urged to be a leader, rather than a follower; to rely on his own power, rather than to ______.

A. inform B. conform C. deform D. reform

26. He would much ______ it if you could do him the favor.

A. award B. apply C. appreciate D. anticipate

27. If our ______ is correct, then the space-craft should reach the moon on Monday.

A. calculation B. composition C. communication D. vision

28. San Francisco’s Chinese community, comprising 67, 000 ______ is the largest concentration of Chinese outside of Asia.

A. visitors B. workers C. adults D. inhabitants

29. We didn’t catch the train on ______ of the traffic congestion.

A. basis B. charge C. account D. behalf

30. Though he has suffered from cancer for so many years, it is so strange that he has ______ to the present day.

A. deprived B. survived C. derived D. revived

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