C. temper D. quality

　　24.This hypothesis states that environments that are too clean may actually make the

　　________system develop oversensitive responses.

　　A. mental B. nervous

　　B. 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 an build _____ nests to provide shelter for their young.

　　A. glories B. elaborate

　　C. splendid D. advanced