题目内容：

任务型阅读

The students were having their chemistry class. Miss Li was telling the children what water was like. After that, she asked her students, “What is water?” No one answered for a few minutes. Miss Li asked again, “Why don’t you answer my question? Didn’t I tell you what water is like?”

Just then, a boy put up his hand and said, “Miss Li, you told us that water has no color and no smell. But where to find such kind of water? The water in the river behind my house is always black and it has a bad smell.” Most of the children agreed with him.

“I’m sorry, children,” said the teacher, “our water is getting dirtier and dirtier. That’s a serious problem.”

根据短文内容，回答问题。

1.Why didn’t the children answer the teacher’s question at first?

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2.Please use a sentence to describe what water is.

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3.Why does the water in the river have color and smell?

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4.Do you think the boy who answered the teacher’s question is stupid?

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5.What did other students think of the boy?

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