閱讀短文，完成下列題目。
   The students were having their chemistry class.Miss Li was telling the children what water was like（像）.After that，she asked her students，"What's water？" No one answered.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（氣味）.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 Li is a

C

C

teacher.
A.math
B.Chinese
C.chemistry
（2）Miss Li told the student that

A

A

.
A.water has no color and no smell
B.water is always black
C.water has a bad smell
（3）Why didn't the students answer Miss Li's question："What's water？"

C

C

A.Because this question is too funny.
B.Because the students didn't listen to Miss Li carefully（認真地）.
C.Because the students can't find clean water.
（4）What should we do to keep water clean？（請用2-3 個完整的英語句子作答）

We should not throw garbages in the river.We shouldn't pour the polluted water into the river.

We should not throw garbages in the river.We shouldn't pour the polluted water into the river.