问题补充：
Are you carrying too much on your back at school? You’re not alone. Back experts(专家) in the USA are worried about that young students are having back and neck problems because they are carrying too much in their backpacks .
“It hurts my back when I run,” said Ebelin 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. Ebelin is one of them. They have regular(固定的)backpacks with two straps(带子) to carry them, but a number of students with heavy loads(负担) 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% of their own body weight. A few students have had a good idea to lighten(减轻) the load: less homework.
Doctor’s suggestions:
Lighten the load. Take home only the books the students need that day.
(2) Wide straps are better. They can send out weight over your shoulders (肩)and be sure to wear backpacks with two straps.
(3) The heaviest things should be packed closest to the back.
(4) Bend(弯曲) both knees when you pick up the pack, don’t just bend over the waist(腰).
【小题1】The main idea of the passage is about .A．the problems made by rolling backpacksB．the advantage of backpacksC．the best backpacks for studentsD．how to lighten students’ backpacks【小题2】From what Ebelin Reyes and Shirley Park said, we know.A．students like to carry heavy backpacksB．students have to do a lot of homeworkC．backpacks with wheels are bad for studentsD．students have no time to play because of heavy backpacks【小题3】The underlined word “switch to” means.A．use forB．turn toC．catch upD．begin to use【小题4】According to the experts, it’s better for a student of 40 kilos to carry a backpack of at most.A．10 kilosB．8 kilosC．6 kilosD．7 kilos【小题5】If students follow the doctor’s suggestions, they.A．may do less homeworkB．may feel their backpacks are lighterC．can learn how to enjoy themselvesD．will know why to wear heavy backpacksD
答案：
(答案→)D
解析：这篇短文主要描述了中美学生的书包都很重，这会对学生的身体造成不良影响。专家对此提出了建议，并号召老师和家长采取适当的措施。
【小题1】根据短文描述，可知本文主要讲述的是如何减轻学生们的背包的问题。故选D。
【小题2】根据短文第二段描述，可知他们背包过重主要是因为作业太多。故选B。
【小题3】联系上下文描述，可知此处指的是许多学生开始使用滚动背包。故选D。
【小题4】根据Experts say that students should carry no more than 10% to 15% of their own body weight.描述，计算可知选C。
【小题5】根据Lighten the load.描述及医生的建议，可知主要目的是减轻载重。故选B，可能感到他们的背包更轻了。
