阅读短文，选择正确的选项。
With the improvement of our living standard, more and more people can afford cars. However, the smoke from the cars makes the air dirty. Air pollution has become a serious problem around the world. That’s very dangerous for us and animals.
We should do something to make the air clean again. But what can we do? We can do some small things in our daily life. For example, we can go to school by bike or on foot. That can reduce the smoke. Trees can clean the air. So we should plant more trees and stop cutting down so many trees. Why not have a try?
1．With the improvement of our living standard, more and more people can _________。( )
| A．buy elevators | B．buy bikes | C．buy cars |
2．_________ from the cars makes the air dirty. ( )
| A．The dust | B．The smoke | C．The wind |
3．How can we make the air clean again? ( )
| A．By planting more trees. |
| B．By riding a bike or walking to school. |
| C．Both A and B. |
4．From the passage we can know that __________.( )
| A．walking to school is very important |
| B．protecting the environment is very important |
| C．cars are very important |
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