(3)

　　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 backpacks 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

　　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 suggesting, 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

　　【答案与解析】本文讲述的是由于学校作业太多，学生上学时要背太多东西，背部容易受伤的问题。

　　1. C。读完全文我们可以知道文章讲的都是最适合和最好的书包，而不是由于书包的滑轮而带来的问题或书包的好处。由此可知答案。

　　2. A。通过Eglin Reyes and Shirley Park说的，我们可以知道什么?Eglin Reyes说背着书包上楼很困难，是因为它太重了。而Shirley Park 的书包重10公斤。我们可得知学生不得不背很重的书包。

　　3. C。专家认为一个40公斤的学生最多能背多少公斤的书包?文章第5段说可以背相对于学生体重10% —15%的重量。那么40公斤的学生最多背40×15%=6公斤。

　　4. D。如果学生听从专家的意见那么他们将如何呢?从专家的建议我们了解到学生如何正确使用书包以减少背部的问题。由此可知答案是 D。