Are you carrying too much on your back at school?而Shirley Park的书包重10公斤

【题目】Are you carrying too much on your back at school? You're not alone. Back experts in the USA were worried that young students are having back and neck problems because they are carrying too much in their backpacks （schoolbags）.

"It hurts my back when I run，" said Beeline Reyes, a student in Virginia. "It's hard to get up the stairs with my backpack because it's too heavy. "

Students have to carry heavy backpacks on their backs for a whole week's study. Beeline is one of them. They have regular back-packs with two straps （带子）to carry them, but a number of students with heavy loads have switched to rolling backpacks. The backpacks have wheels and can roll on the ground.

Shirley Park's backpack weighs 10 kilos, and she said，"I'll change to a rolling backpack because I am starting to have back pain. "

How much is too much? Experts say that students should carry no more than 10 to 15 percent of their own body weight. A few students have had a good idea to lighten the load ： Less homework.

Doctor's suggestions ：

•Lighten the load. Take home only the books the students need that night.

•Wide straps are better. They can send out weight over your shoulders and be sure to wear backpacks with two straps.

•The heaviest things should be packed closest to the back.

•Bend （弯曲）both knees when you pick up the pack, don't just bend the waist（腰）.

【1】The main idea of the text is __________.

A. the problems made by rolling backpacks

B. the goodness of backpacks

C. the best backpacks for students

D. how to make students' backpacks light

【2】From what Eglin Reyes and Shirley Park said, we know __________.

A. students have to carry heavy backpacks

B. students have to do homework

C. backpacks with wheels are bad for students

D. students have no time to play because of homework

【3】By the words of the experts, it's better for a student of 40 kilos to carry a backpack of at most __________.

A. 10 kilos    B. 8 kilos

C. 6 kilos    D. 7 kilos

【4】If students follow the doctor's suggestions, they __________.

A. may do less homework

B. may feel their backpacks are lighter

C. can learn how to enjoy them

D. will know how to use backpacks