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  3. California State Law requires that all bicycle riders under age 18 wear protective helmets whenever they ride on public streets

California State Law requires that all bicycle riders under age 18 wear protective helmets whenever they ride on public streets

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问题     California State Law requires that all bicycle riders under age 18 wear protective helmets whenever they ride on public streets or trails．Medical research shows that 85% of【B1】______brain injuries can be【B2】______by wearing a bicycle helmet．About 1000 bicycle riders are killed in the U.S.every year，usually in【B3】______with cars，and 75% of them die of head injuries．Many thousands more suffer less severe but still debilitating injuries which are【B4】______than simple road rash and broken bones．Children can suffer permanent personality changes and learning【B5】______from a brain injury．Common long term【B6】______includes concentration difficulties，aggressiveness，headaches and balance problems．【B7】______your great pain if this happens and you have to blame it on your【B8】______to buy a helmet!
    There are many good helmets off the market．You can make your choice based on three criteria：【B9】______．
    A helmet that doesn’t fit，doesn’t sit correctly on your child’s head，not only looks silly but is less than useless．A good reason to purchase the helmet from a bike store is the fact that【B10】______．You shouldn’t expect the sales to help at a discount or department store to correctly perform the service．Some helmets look better than others．【B11】______．
【B3】
选项
答案collision
解析 空前的in和空后的with提示此处所填词应为名词。本句bicycle riders…killed…died of head injury是和cars通常相关的，此处可能要表达骑车人经常与汽车相撞导致脑部受伤而死亡。
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