人教版九年级下册英语Unit 13 Section A长江作业本答案

1Unit 13 Section A第一题答案

1、water pollution，air pollution，waste pollution，noise pollution

2、（1） am／is／are+现在分词构成

（2） have／has+动词的过去分词

（3）助动词be+及物动词的过去分词

（4）情态动词+be+及物动词的过去分词

2Unit 13 Section A第二题答案

Ⅰ、

1、used to do

2、play a part in

3、cut down air pollution

4、instead of

5、keep public places clean

Ⅱ、

6	7	8	9	10
D	C	D	C	B

Ⅲ、

11、What；to do

12、didn't there

13、Is；anything

14、was painted

15、took a bus

3Unit 13 Section A第三题答案

Ⅰ、

1、hear of

2、cut off

3、so far

4、be harmful to  

5、not only. . . but also. . .

6、bring danger to

7、the number of

8、no longer

Ⅱ、

9、NVithout；no longer

10、drop too low；ocean life

11、So far；have shown   

12、taken part in

13、heard of

Ⅲ、

14、The place was not only cold， but also humid

15、We can't afford to go abroad this summer.

16、The number of students in this class is 50.

17、I understood this sentence by asking my/the teacher for help.

18、Smoking too much is harmful to his health.

19、We should ride our bikes or walk to school instead of driving.