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约6510字。
　　Unit 4 Exploring plants
　　单元检测题
　　第二部分：英语知识运用（共两节，满分45分）
　　第一节：语法和词汇知识（共15小题；每小题1分，满分15分）
　　从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
　　21. In the botanical garden we can find a(n) _______ of plants that range from tall trees to small flowers.
　　A. species B. groups ount D. variety
　　22. This is a very special flower and it can _______ a strong sweet perfume at night.
　　A. give in B. give up C. give out D. give out
　　23. If you _______ a mistake in reviewing the report, please bring it to my attention.
　　A. e along B. e across e around to D. e about
　　24. In dealing with public relations, we should make every effort to prevent the _______ in personality.
　　A. contact B. contrast C. connection D. conflict
　　25. It was __________ bae after he finished the report.
　　A. not until midnight did he go B. until midnight that he didn’t go
　　C. not until midnight that he went D. until midnight when he didn’t went
　　26. They are so close friends and their friendship ________ college days.
　　A. dates back to B. dates back C. dates to D. dates back from
　　27. —Can you give me some advice about the design?
　　—I think it should _______ to all ages and social groups.
　　A. appear B. appeal C. suit D. fit
　　28. The government not only ________ the refugees（难民）houses to live in, but also _______ them with food and clothes.
　　A. offered; offered B. provided; provided C. provided; offered D. offered; provided
　　29. The teacher ______ several times, but he still didn’t understand it.
　　A. explained John the sentence B. explained the sentence for John
　　C. explained to John the sentence D. explained about the sentence to John
　　30. ______, he would e in late and then say he was sorry.
　　A. eventually B. typically C. particularly D. especially
　　31. There was a nice little present for everyone, with a suitable poem _______ to it.
　　A. attached B. attacked C. attracted D. attributed
　　32. —Please ______ your passport.
　　—I’m sorry, but I _______ in my home.
　　A. show me; left it B. show to me; left I C. show me; forgot it D. show to me; forgot it
　　33. According to recent reports, one of the rare animals, ____ crocodile, is in ____ danger of dying out.
　　A. a; the B. 不填; a C. 不填; the D. the; 不填
　　34. --- Did you have any difficulty catching yesterday’s lecture?
　　--- No. The professor spoke very clearly to make his speech easy ____.
　　A. understood B. understand C. understanding D. to understand
　　35. --- Why did Miss Li leave the job?
　　--- She ____ for higher wages, but was turned down in the end.
　　A. broke off B. gave away C. held out D. picp
　　36. --- Is Alice playing both basketball and tennis for your school?
　　--- She ____. But now she has given up playing basketball.