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24. This hypothesis states that environments that are too clean may actually make the_____           system develop oversensitive responses.

    A. mental               B. nervous          C. immune           D. physical

25. The Adult Vocational College is an opportunity to gain the right qualifications for various careers for it offers an_____ range of subjects and courses.

A. additional           B. excessive            C. adequate         D. extensive

26. It’s disturbing to note how many of the crimes we do know about were detected _____          not by systematic inspections or other security procedures.

A. by accident          B. on schedule          C. in general           D. at intervals

27. You can always_____ Jim in a crisis，for he is simply the most helpful person I’ve ever known.

A. refer to         B. count on         C. cope with            D. run into

28. He wanted to stay at home，but at last he agreed，very_____，though，to go to the concert.

A. decisively           B. reluctantly          C. willingly            D. deliberately

29. The audience，hostile at first，were greatly_____ by her excellent performance.

A. annoyed          B. encouraged           C. impressed            D. depressed

30. Many birds and insects can build_____ nests to provide shelter for their young.

A. glories          B. elaborate            C. splendid         D. advanced

Part Ⅲ Reading Comprehension（45minutes，25points）

Directions：There are five passages in this part. Each passage is followed by five questions or unfinished statements. For each of them there are four choices marked A，B，C and D. Choose the best one and mark the corresponding letter with a single bar across the square brackets on your machine-scoring ANSWER SHEET.