1. 阅读理解

Cars are lots of fun, but they could also be dangerous. We have to be careful when we drive them or ride in them.

It's always a good idea to put on your seat belt when you're in a car. Why? Think about this example: You put an egg on a skateboard and give it a push. If the skateboard hits a stone, it will stop, but the egg won't. It will fly through the air, hit the ground and break.

Now think what would happen if you tied the egg to the skateboard. When the skateboard hits a stone. The egg won't go flying. It will stay safely on the skateboard. Volvo, a famous Swedish carmaker, was the first to use seat belts in 1849.

Air bags are also very important for car safety, because sometimes a seat belt isn't enough. If the car is going really fast and runs into something, seat belts could even hurt the people who wear them. Most new cars have air bags in front of and next to the seats. When a car hits something, its air bags will come out quickly in less than one second, to keep the people inside safe,

1. （1） The passage mainly tells us        .

   A . what air bags are B . why we must tie the egg to the skateboard C . two important ways to keep safe in cars D . how seat belts work to make cars safe
3. （2） The writer gives the example of the egg to         .

   A . show why it is important to wear a seat belt when in a car B . tell us that eggs are easy to break C . tell us what a skateboard is D . show how to wear a seat belt
5. （3） Seat belts can make cars safer because           .

   A . they are made of strong materials B . people are interested in them C . they can help us stay safely on the seats D . they can stop us from hitting other cars
7. （4） Air bags are also important for cars because they          .

   A . work together with seat belts to keep us safe C. are put in front of and next to the seats B . can stop cars hitting each other D. are made of plastic