Are you carrying too much on your back at school? You’re not alone. Back experts(專家) 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(帶子) to carry them, but a number of students with heavy loads(負擔) 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(減輕) 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(彎曲) both knees when you pick up the pack, don’t just bend over the waist(腰).
小題1:The main idea of the passage is about _______.
A．the problems made by rolling backpacks
B．the advantage of backpacks
C．the best backpacks for students
D．how to lighten students’ backpacks
小題2:From what Ebelin Reyes and Shirley Park said, we know______.
A．students like to carry heavy backpacks
B．students have to do a lot of homework
C．backpacks with wheels are bad for students
D．students have no time to play because of heavy backpacks
小題3:The underlined word “switch to” means______.
A．use forB．turn toC．catch upD．begin to use
小題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
小題5: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 themselves
D．will know why to wear heavy backpacks

小題1:D
小題2:B
小題3:D
小題4:C
小題5:B

試題分析：這篇短文主要描述了中美學生的書包都很重，這會對學生的身體造成不良影響。專家對此提出了建議，并號召老師和家長采取適當?shù)拇胧?br />小題1:根據(jù)短文描述，可知本文主要講述的是如何減輕學生們的背包的問題。故選D。
小題2:根據(jù)短文第二段描述，可知他們背包過重主要是因為作業(yè)太多。故選B。
小題3:聯(lián)系上下文描述，可知此處指的是許多學生開始使用滾動背包。故選D。
小題4:根據(jù)Experts say that students should carry no more than 10% to 15% of their own body weight.描述，計算可知選C。
小題5:根據(jù)Lighten the load.描述及醫(yī)生的建議，可知主要目的是減輕載重。故選B，可能感到他們的背包更輕了。
點評：本文中長句較多，一時很難讀懂句子含義，注意多讀幾遍，不要強求非得理解一詞一句的含義，能把握文章大意就行。然后帶著問題閱讀短文，一般就能順利找出答題依據(jù)。對于有關(guān)數(shù)字的問題,要認真分析,并進行必要的計算.
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