题目内容：

People usually check whether their keys, purses and phones are with them before going out. but many people in China now have one more important thing to take——a mask（口罩）. They hope that it can protect them ____ the polluted air.

Many cities in China appeared a lot of foggy days in April. In Beijing, there were eight days in April full of smog. It is dirty air that ____ a mixture of fog and smoke. The smoke is mainly from cars and factories in cities. Poor air is bad for people’s health, ____ for children and old people. They fell ill easily and the ____ were full of people. They had problems with their noses and lungs.

So, it’s necessary to ____ people from doing so many bad things to the environment. For example, people should use cars less and shouldn’t burn lots of ____ and gas.the government needs to take measures to make factories stop pouring too much waste ____  into the sky.

Three students from No. 4 High School in Beijing ____ a report about how to protect the environment. They suggested that people should plant more trees ____ set off fewer fireworks for celebration.

We hope ____ people will join us in making a difference. In this way, the blue sky will certainly appear again.

1.A. of    B. from    C. for    D. at

2.A. looks like    B. looks after    C. looks up    D. looks into

3.A. specially    B. suddenly    C. especially    D. luckily

4.A. schools    B. gardens    C. zoos    D. hospitals

5.A. stop    B. advise    C. suggest    D. warn

6.A. wood    B. coal    C. plastic    D. glass

7.A. sun    B. water    C. air    D. things

8.A. wrote    B. spoke    C. watched    D. expressed

9.A. but    B. so    C. and    D. or

10.A. fewer    B. less    C. some    D. more