20．听短文，根据短文内容在各题所给的 A、B、C 三个选项中，选出一个最佳选项．（本题听两遍） 21．Mr．Smith is explaining the importance of in the science lesson A．air B．food C．water 22．Why didn't the students want to answer the teacher？ A．Because they think the question is too easy． B．Because they don't know how to answer the question． C．Because they want to answer the question after the lesson． 23．What does the water in the river behind the boy's house look like？ A．Black B．Red C．Green 24．Why can't people swim in that river now？ A．Because there are dangerous animals in the river． B．Because the river is too dirty． C．Because the water is too deep． 25．What did Mr．Smith want to do？ A．He wants to swim in the river． B．He wants to go fishing in the river． C．He wants to make water clean．
17．请根据所听内容，在每小题给出的三个选项中，选出一个能回答问题的最佳答案，并将答题卡上对应题目所选的选项涂黑．短文听两遍． 16．What are the three men？ A．Businessmen．B．Reporters．C．Singers． 17．Where do they go at noon？ A．Go to the beach．B．Go to the meeting room．C．Go to the mountain． 18．What do they find there？ A．A magic stick．B．An old oil lamp．C．An old house． 19．What does the first man want？ A．A beautiful garden near the sea．B．A big house in the countryside． C．A big house in the mountain． 20．What do you think would happen at last？ A．Those two persons are back．B．They all enjoy the rest of their lives． C．The third person is gone to his big house．
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