Exercises 2. Some measures ______ to protect wildlife resources. A. are taking B. are taken

　　C. are being taken D. being taken

　　【分析】解此题时首先要注意到词组take measures to do sth.，由于题干中把宾语measures提前，应该使用被动语态；句子的意思是“正在采取一些措施去保护野生资源”。在表达现在进行时的被动语态的结构中，选项A、B、D均不完整，正确答案应是C。

　　Exercises 3. —Have you moved into the new house? 　—Not yet. The rooms______. A. are being painted B. are painting

　　C. are painted D. are being painting 【分析】通过题干情景，我们不难看出，由于正在粉刷，因此还不能搬进新房子。分析选项，B项语态不对；C项时态不对；D项结构错误，所以正确答案应该是A。

　　Exercises 4. A new building ______ at the other side of the street. Work started last year and the building is expected to open next year. A. is built B. is being built

　　C. has built D. will be built

　　【分析】 题干的后半部分告诉我们：“去年开工，预计明年竣工。”由此可知，大楼正在建设中，所以选项A、C、D时态均不对。正确答案应该是B。

　　Exercises 5. It is well-known to us that a lot of rivers ______ by the factories. A. are polluting B. have been polluting

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