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School backpacks have been a hot topic in China recently. Some Chinese parents buy school backpacks from Japan, although they can be as expensive as 5000 yuan, reports Chinese newspaper Urban Express.

A good backpack is important for children’s health. “It can relieve(缓解) pressure from the spine and shoulders,” says Dr Rob Danoff from the US. He also says students need a backpack that’s made for the child’s size. Cushioned(加垫的) backs and shoulder straps(带子) will help them avoid pain. Another choice is a small roller bag, but some schools do not allow them because they may knock people over.

However, the biggest problem for school backpacks is that they are too heavy, noted Hou Weiguang, a bone doctor from No. 363 Hospital in Chengdu. In China, students have many textbooks and exercise books. The weight makes many kids suffer from side-banding(侧弯的) spines, said Hou. He suggests a backpack should be no more than 15 percent of a child’s body weight to avoid pain or injury. That means if a student weighs 50 kg, the backpack should be less than 7.5 kg.

Parents need to make sure their kids only carry what they need. Schools and governments need to help too, added Zheng Yongshun, an education official from Hong Kong.

1._______ have been a hot topic in China these years.

A Textbooks and exercise books

B Schools rules

C School backpacks

D The pressure

解析：选C。细节理解题。根据第一段第一句School backpacks have been a hot topic in China recently.可知，故选C。

2.Dr Rob Danoff says students need a backpack ______.

A that’s made for their size

B which is expensive

C which is small

D that can carry more books

解析：选A。细节理解题。根据第二段He also says students need a backpack that’s made for the child’s size.可知，学生们需要的是为他们量身定做的背包，故选A。

3.Which is TRUE according to the passage?

A Cushioned backs and shoulder straps won’t avoid pain.

B Parents won’t buy schools backpacks from Japan because they are too expensive.

C If a student weighs 50 kg, the backpack should be more than 7.5 kg.

D Hou Weiguang is a bone doctor from No. 363 Hospital in Chengdu.

解析：选D。细节理解题。根据第三段第一句…noted Hou Weiguang, a bone doctor from No. 363 Hospital in Chengdu.可知，故选D。

4.If a child is 40 kg, his backpack should be less than _______.

A 6 kg

B 7 kg

C 8 kg

D 9 kg

解析：选A。推理判断题。根据第三段最后一句That means if a student weighs 50 kg, the backpack should be less than 7.5 kg.可知，如果孩子体重40公斤，其书包重量最好不要超过6公斤，故选A。

5.It’s suggested that kids should________.

A carry one or two books

B only carry what they need

C carry more books

D only carry textbooks and exercise books

解析：选B。B 细节理解题。根据最后一段的“Parents need to make sure their kids only carry what they need. ”可知，孩子们应该只携带所需的东西，故选B。