根据短文的内容回答，下列题目SomeSchoolingonBackpackAccordingtotheU.S.ConsumerProductSafet

共享题干题根据短文的内容回答，下列题目Some Schooling on Backpack 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 and strains caused by backpacks. Such injures are so widespread that more than 70 percent of physicians take it 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 a belt. That will help transfer some of the weight from the back and shoulders to the hips. You should also tighten both straps firmly, so the pack rests about 2 inches above your waist. Also,remember to pack your bag 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 rule is not to exceed 20 percent of your body weight. So if a child weights 100 pounds, the backpack and its load should not be more than 20 pounds. One hint: Make frequent trips to your locker (储物柜) to exchange books between classes.Backpacks with wheels let you pull the weight along the ground, but they have problems too. Many are larger than the average shoulder bag, so students ai'e tempted to carry more than they would in a conventional pack. Roller bags often don't fit into a locker. They can also lead to tripping and falls in crowded halls. Whatever you use. l0 or l 5 minutes of stretching and back strengthening is a good idea.1.[不定向选择题]A 100-pound child should carry a backpack of more than 20 pounds.A.Right B.Wrong C.Not mentionedABC确定 2.[不定向选择题]A 10-15 minutes' exercise will help you bear a heavier backpack.A.Right B.Wrong C.Not mentionedABC确定

1.参考答案：B
参考解析：题干：一个100磅重的孩子应该背超过20磅重的背包。利用题干关键词100 pounds和20 pounds等可以定位到第三段“So if a child weights l00 pounds，the backpack and its load should not be more than 20 pounds．”，即“如果孩子的体重100磅，那么背包及其所装东西的重量不应超过20磅”，由此可知，题干信息与原句信息不一致，故答案为B。?
2.参考答案：A
参考解析：题干：10～15分钟的锻炼会有助于你承受一个较萤的背包。利用题干关键词10～15minutes等可以定位到最后一段“Whatever you use，10 or 15 minutes of stretching and back strengthening is a good idea．”，即“无论你使用哪一种包，10～15分钟的拉伸和背部拉伸都是个不错的主意”，由此可知，做10～15分钟的拉伸锻炼有助于缓解背部因为较重的背包引起的疲劳，故答案为A。?3.[不定向选择题]Roller bags tend to be heavier than ordinary backpacks.A.Right B.Wrong C.Not mentionedABC确定

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