Are you carrying too much on your back at school? I’m sure lots of children of your age wi

Are you carrying too much on your back at school? I’m sure lots of children of your age will say “Yes”. Not only the students in China have this problem, but children in the United
States also have heavy school bags.
Doctors are starting to worry that younger and younger students are having back and neck problems as a result of school bags being too heavy for them.
“It’s hard for me to go upstairs with my bag because it’s so heavy,” said Rick Hammond, an 11-year-old student in the US.
Rick is among students who have common school bags with two straps (带子) to carry them, but many other students choose rolling bags.
But even with rolling bags, getting up stairs and buses is still a problem for children. Many of them have hurt their backs and necks because of the heavy school bags.
But how much is too much? Doctors say students should carry no more than 10% to 15% of their own body weight.
Scott Bautch, a back 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!
【小题1】From the passage we can know that . A．only children in China carry too heavy school bagsB．both children in China and the US carry too heavy school bagsC．children in other countries don’t carry too heavy bagsD．only children in the US carry too heavy school bags【小题2】Children feel it hard for them to go upstairs because .A．they are too youngB．they don’t know how to go upstairs C．their school bags are too heavyD．their parents don’t always go upstairs with them together【小题3】If a child carries a heavy school bag, .A．his back and neck will be hurtB．his head and arms will be hurtC．his hands will be hurtD．his feet will be hurt【小题4】According to the doctor, Scott Bautch, if a child in Grade 5 weighs about 30 kilos, the school bag he carries should not be over .A．5 kilosB．3 kilosC．5.5 kilosD．4.5 kilos【小题5】Some students think the best answer to his problems is that .A．they should have a little homework to do after they get homeB．their teachers had better not ask them to do any homework C．they should only take home library books they will read that nightD．they should use thin workbooks instead of thick onesB

(答案→)B 解析：本文主要介绍了中国和美国的学生都面临的书包太重的问题，而且过重的书包还给孩子的健康带来问题。【小题1】细节题。根据文章第一段最后一句Not only the students in China have this problem, but children in the United States also have heavy school bags.可知中国和美国的学生的书包都比较重，学习的负担都很重。故B正确。【小题2】细节题。根据文章第3段It’s hard for me to go upstairs with my bag because it’s so heavy,” said Rick Hammond, an 11-year-old student it the US.可知学生很难爬楼梯主要是因为书包太重了。故C正确。【小题3】细节题。根据文章第2段Doctors are starting to worry that younger and younger students are having back and neck problems as a result of school bags being too heavy for them.可知医生告诉我们如果孩子的书包太重，他们的背部可能会出现问题。故A正确。【小题4】D 计算题。根据Doctors say students should carry no more than 10% to 15% of their own body weight(重量).、可知学生的书包的重量最好不要超过体重的百分之15.如果体重是30公斤，书包最多4.5公斤。故D正确。【小题5】B 细节题。根据文章最后一句One of the best answers is, as some children said, to have no homework at all!可知没有家庭作业是最好的解决方法。故B正确。

就是这个解释

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