题目内容：

The students were having their Chemistry（化学）class. Miss Hua was telling the children what water was like. After that, she asked her students, “What's water?” No one spoke for a few minutes．Miss Hua 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 Hua, you told us that water has no colour 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 problem．

1.Miss Hua was telling the children what ______ is like．

A. river         B. water       C. earth              D. weather

2.A boy said，“The water in the river behind my house is always _______．”

A. clean         B. black        C.  white              D. clear

3.The water in the river has a bad smell because it is getting ______．

A. more and more        B. less and less

C. cleaner and cleaner  D. dirtier and dirtier