Kids go their way to school every day wearing big backpacks. Even high school students have to bend forward to lug their heavy books and binders to and from school. It looks a little silly, but is it dangerous?

Yes, say many experts. “Kids are saying ‘My back hurts, my neck and my shoulders hurt,’” says Dr. Karen Jacobs, a professor at Boston University. “Since at least 1998, we’ve noticed backpacks getting bigger and heavier, and not in proportion to the kids’ sizes.” 

How heavy is too heavy? “As a general rule, research shows the backpack should be no more than 10 to 20 % of a child’s body weight to avoid pain or potential injury,” Jacobs says. For an elementary school child who weighs just 50 or 60 pounds, a couple textbooks and lunch could push a pack beyond the safe threshold. For that reason, Jacobs says it’s important that kids are carrying only what they need. “We’ve noticed that students are taking lots and lots of water to school with them, which is a lot of extra weight,” Jacobs says. She recommends packing an empty water bottle and filling it at school. Another tip is to pack the heaviest items in the middle of the pack, closer to the back.

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1.What does the passage mainly talk about?

A Education

B Backpacks

C Health

D University

解析：选B。B 细节理解题。根据文章第一段第一句Kids go their way to school every day wearing big backpacks.可知。

2.A big backpack may let the students hurt________.

A their necks

B their feet

C their hearts

D their hands

解析：选A。A 细节理解题。根据文章第二段第一句“Yes, say many experts. “Kids are saying ‘My back hurts, my neck and my shoulders hurt,’” ...可知。

3.What does Jacobs do according to the passage?

A A doctor

B A professor

C A writer

D A manager

解析：选B。B 细节理解题。根据文章第二段第一句...a professor at Boston University .可知。

4.If you weigh 50 kilogram, you’d better wear a_____backpack.

A 5 kilogram

B 12 kilogram

C 15 kilogram

D 20 kilogram

解析：选A。A 推理判断题。根据第三段第二句As a general rule, research shows the backpack should be no more than 10 to 20 % of a child’s body weight to avoid pain or potential injury...可知。

5.Which of the following is not true according to the passage?

A It is dangerous for students to wear too heavy backpacks.

B It is important for children to carry the things they need.

C The students don’t need to take lots of water to school.

D The students’ backpacks become lighter and lighter since 1988.

解析：选D。D 推理判断题。 根据文章第二段最后一句...we’ve noticed backpacks getting bigger and heavier, and not in proportion to the kids’ sizes.可知。