own body weight.

　　Scott Bautch, a doctor, said children under Grade 4 should stay with 10%. But it is also important that older children don't stay with over 15%, because their bodies are still growing. "Children are losing their balance and falling down with their school bags," he said.

　Parents and teachers are starting to tell children to only take home library books they will be reading that night. Some teachers are using pieces of paper or thin workbooks for students to take home.

　One of the best answers is, as some children said, to have no homework at all!

24. From the passage we can know that .

A. only children in China carry too heavy school bags

B. both children in China and the US carry too heavy school bags

C. children in other countries don't carry too heavy bags

D. only children in the US carry too heavy school bags

25. If a child carries a heavy school bag, .

A. his back or neck will be hurt B. his head and arms will be hurt

C. his hands will be hurt D. his feet will be hurt

26. According to Scott Bautch, if a child in Grade 5 weighs about 30 kilos, the school bag he carries should not be over ________.

A. 5 kilos B. 3 kilos C. 5.5 kilos D. 4.5 kilos

27. Some students think the best answer to this problem is that .

A. they should have a little homework to do after they get home

B. their teachers had better not ask them to do any homework

C. they should only take home library books they will read that night

D. they should use thin workbooks instead of thick ones

　　The popularity of bicycling continues to rise, and it is no surprise. It's fun, healthy and eco-friendly. Maybe that's why there are 1.4 billion bicycles and only 400 million cars on roads worldwide today. Bikes can take you almost anywhere, and there is no fuel cost!

Hop on a bicycle and ride around your neighborhood. You may discover something new in your community. Stopping and getting off a bike is easier than stopping and getting out of your car. In many