1 . We all know that reading in the sun ________ our eyes.（对……有害）

2 . Light pollution is ________ to our eyes. (harm)

3 . 根据每小题所提供的图画情景和提示词，写出一个与图画情景相符的句子。
1. 2.    3. 4.      5.
1. stop, trees _____________________________________________________________________
2. soldier, for two years _____________________________________________________________
3. noise, harmful __________________________________________________________________
4. use, electricity __________________________________________________________________
5. play, now ______________________________________________________________________

4 . 根据每小题所提供的图画情景和提示词，写出一个与图画情景相符的句子。
1. enjoy________________________________________
2.    be harmful to________________________________________
3.    should________________________________________
4. wish, some day________________________________________
5.    invent, 1895________________________________________

5 . 吸烟对我们健康有害。
Smoking can ______________________ our health.

6 . 我们每天都会制造垃圾，而这些垃圾对我们的环境有危害。
We produce waste every day and it ______ ______ to our environment.

8 . I heard this kind of medicine is ________（有害的）to people. You’d better not take it.

9 . Be careful! That dog is h________ to you.

10 . 英汉互译。
1. 听说________
2. be harmful to ________
3. at the top of ________
4. the food chain ________
5. 参加________
6. 关闭 ________
7. pay for ________
8. take action________