阅读短文，选择最佳答案。
The students were having their chemistry (化学) class. Miss Li 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 Li asked
again. " Why don't you answer my question? Didn't 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 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. That's a problem."
1. The students were having their _______________ class.
A. English
B. Chinese
C. chemistry
D. maths
2. Miss Li was telling the children what _______________ was like.
A. water
B. air
C. earth
D. weather
3. A boy said, " The water in river behind my house is always _______________."
A. white
B. black
C. clean
D. clear
4. Most of the children _______________ the boy.
A. agreed with
B. wrote to
C. heard from
D. sent for
5. The water in the river has colour and smell because it is getting _______________.
A. more and more
B. less and less
C. cleaner and cleaner
D. dirtier and dirtier