The students were having their chemistry class. Miss Li was telling the children what water was like. 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. 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.The students were having ________ class.

A Chinese

B math

C English

D chemistry

解析：选D。D 细节理解题。根据The students were having their chemistry class.可知同学们正在上化学课，故选D。

2.Miss Li was telling the children what the ________ was like.

A air

B earth

C water

D weather

解析：选C。C 细节理解题。根据Miss Li was telling the children what water was like.可知李老师正告诉孩子们水是什么样的。故选C。

3.What color is the water in the river behind the boy’s house?

A White.

B Black.

C Clean.

D Clear.

解析：选B。B 细节理解题。根据The water in the river behind my house is always black可知男孩房子后面的河水是黑色的，故选B。

4.Most of the students ________ the boy.

A heard from

B wrote to

C sent for

D agreed with

解析：选D。D 细节理解题。根据Most of the children agreed with him.可知大多数孩子都同意男孩的话，故选D。