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共用题干 Some Schooling on BackpacksAccording to the U.S.Consumer Product Safety...

admin2020-12-24  45
问题 共用题干
Some Schooling on Backpacks
According to the U.S.Consumer Product Safety Commission,5,900 kids were treated at hospital emergency rooms,clinics,and doctors'offices last year for sprains（扭伤）and strains caused by backpacks.Such injuries are so widespread that more than 70 percent of physicians surveyed by the American Academy of Orthopedic（整形外科的）Surgeons listed backpacks as a potential clinical problem for children.
How do you avoid such problems? Choose bags that have wide , padded straps（有垫的背带）and abelt.That will help transfer some of the weight from the back and shoulders to the hips.You should alsotighten both straps firmly,so the pack rests about 2 inches above your waist.Also,remember to pack yourbag with the heaviest items closest to your back and to bend both knees when you pick it up.
How much should you stuff into your pack?That depends on your size and strength,but a general ruleis not to exceed 20 percent of your body weight.So if a child weighs 100 pounds,the backpack and its loadshould not be more than 20 pounds.One hint : Make frequent trips to your locker（储物柜）to exchangebooks between classes.
Backpacks with wheels let you pull the weight along the ground,but they have problems too.Many arelarger than the average shoulder bag,so students are tempted to carry more than they would in a conventionalpack.
Roller bags often don't fit into a locker.They can also lead to tripping and falls in crowded halls.
Whatever you use,10 or 15 minutes of stretching and back strengthening is a good idea.
选项 A100-pound child should carry a backpack of more than 20 pounds.
A:Right
B:Wrong
C:Not mentioned
答案B
解析由文章第一段第一句可知，根据统计，去年美国有5 900个孩子因为由背带书包引起的扭伤及拉伤而接受治疗，故题干表述正确。
文章第一段最后一句中关于此处的表述背景是在美国，而题干中是英国，并且此处的70%指的是占接受调查医生总数中的比例。故题干描述错误。
由文章第二段中第二句和第三句可知，选择一个带有背带垫和腰带的背包有助于把背包的一部分重量从肩部和背部转移分担到臀部。
由文章第三段第三句可知，如果一个孩子体重为一百磅，那么他的背包负重不应超过 20磅。
由文章第三段最后一句可知，文章给出的建议是经常去储物柜调换不同科目用的课本，而不是将所有的课本都放人储物柜里。
文章第四段第二句中提到很多拉杆式书包比普通有肩带的背包要大，但并未提到其重量。
由文章最后一段最后一句可知，10到15分钟的拉伸和背部强化锻炼会是很不错的方法，故题干描述正确。
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