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 schools 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（有滚轮的）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（重量）.
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（平衡） 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!
（1）From the passage we can know that .
A. only children in China carry too heavy school bags B. children in other countries don't carry too heavy bags
C. both children in China and the US carry too heavy school bags D. only children in the US carry too heavy school bags
（2）Children feel it hard for them to go upstairs because ____________.
A. they are too young B. their school bags are too heavy
C. they don't know how to go upstairs D. their parents don't always go upstairs with them together
（3）According to the doctor, Scott Bautch, if a child in Grade 5 weighs（重） 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
【答案】（1）C
（2）B
（3）D
【解析】【分析】短文大意：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，而且过种的书包还给孩子的健康带来问题。
（1）细节理解题。根据Not only the students in China have this problem, but children in the United States also have heavy school bags.不仅是中国学生而且美国的孩子们也有沉重的书包。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C正确。
（2）细节理解题。根据 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.但是即使使用带滑轮的书包，上楼和公共汽车对于孩子们来说仍旧是一个问题。他们中很多人因为沉重的书包背部和颈部受伤了。可知是沉重的书包使得他们感到上楼难。故选B。
（3）数学计算题。根据Doctors say students should carry no more than 10% to 15% of their own body weight（重量）.医生说学生背的东西应该不超过他们体重的10%到15%。因此体重30公斤的学生背的书包的最重为30*15%=4.5公斤，故选D。
【点评】此题考查阅读理解。先读问题，弄清考查要点，以便能带着问题看文章，这样会心中有数，有的放矢。快速浏览全文，掌握全貌，注意发现与问题有关的信息，如果时间紧，至少要扫视一下起首段和尾段。再把标题和文章内容结合起来想一想，这样全文大意便清楚了。此时，不要忙于答题。细读原文，捕捉相关信息词，掌握短文细节内容。重读原文，仔细斟酌核对答案。
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