听下面十段对话，每段对话后有一个问题，对话读两遍。请根据每段对话的内容和后面的问题，从所给的三个选项中选出问题的正确答案。
1.A.The way to go to school.
B.How to go shopping.
C.The pollution on the Earth.
2.A.She exchanged unwanted things.
B.She collected waste paper.
C.She gave a report.
3.A.Plant trees.
B.Pick up rubbish.
C.Take a trip.
4.A.2,000.
B.50.
C.15.
5.A.Stop polluting the air.
B.Stop burning wood.
C.Take shopping bags to the supermarket.
6.A.She went to a river.
B.She went to a park.
C.She went to a factory.
7.A.Riding bikes to school.
B.Recycling soft drink bottles.
C.Using both sides of the paper.
8.A.It first began in the US.
B.It is on April 24th.
C.2 million Americans celebrated the first Earth Day.
9.A.How to stop pollution.
B.How to plant more trees.
C.How to stop using plastic bags.
10.A.Put rubbish into the bin.
B.Help clean the park.
C.Take a paper bag with him.

1.C 2.A 3.A 4.B 5.C 6.C 7.C 8.A 9.A 10.A

听第11段材料,回答第11、12小题。
11.What pollution are the two speakers talking about?
A.Noise pollution.
B.Water pollution.
C.Air pollution.
12.What are they going to do to protect the environment later?
A.To make a programme.
B.To raise some money.
C.To make some signs.

11.B 12.C

听第12段材料,回答第13—15小题。
13.How many kinds of pollution does the speaker talk about?
A.Two.
B.Three.
C.Four.
14.What does burning things pollute?
A.The water.
B.The land.
C.The air.
15.What's important according to the speaker?
A.To stop pollution.
B.To plant trees.
C.To save water.

13.B 14.C 15.A