Book 9 Unit 4 综合检测题第二部分：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 C. amount D. variety22. 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 out23. If you _ a mistake in reviewing the report, please br
