题干
根据短文内容，选择正确答案。
In most parts of the world, many students help their schools make less pollution. They join environment club. In an environment club, people work together to make our environment clean.
Here are some things students often do.
No-garbage lunches. How many lunch bags do you throw away after lunch? Environment clubs ask students to bring their lunches in bags that can be used again. Every week they will choose the classa that make the least garbage and report them to the whole school.
No-car day. On a no-car day, nobody comes to school in a car including the students and the teachers. Cars give pollution to us, so remember:
Walk, jump, bike, or run!
Use your legs! It's lots of fun!
Turn off the water! Do you know that some toilets can waste twenty to forty cubic（立方米）of water an hour? In a year, that would fill in a small river. In the environment clubs, students mend（修理）those broken toilets.
We love our environment. Let's work together to make it better.
