According to the U.S. National Highway Traffic Safety Administration (NHTSA), car crashes are the leading cause of death among c

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问题 According to the U.S. National Highway Traffic Safety Administration (NHTSA), car crashes are the leading cause of death among children  (41)   5 and 14 years of age. Says NHTSA: "Over 50% of children who die in crashes are  (42)   by safety devices.  (43)  , 4 out of 5 children are improperly restrained."
    The NHTSA offers a number of safety tips and  (44)   for those who are accompanied by children while driving. Although laws  (45)   from country to country and even from state to state, these guidelines may  (46)   food for thought to many parents and guardians of children. Please check your local laws and do  (47)   you can to keep your precious baby safe.
    The safest place for all children is in the back seat. Infants should be  (48)   in a rear-facing safety seat in the backseat of the car. A child at least a year old and  (49)   at least 20 pounds may be placed in a forward-facing seat. At 40 pounds, the child can use a "booster seat", which is secured by one of the car’s lap and shoulder  (50)  . At approximately 80 pounds and a height of about four feet nine inches, the child may begin using an adult safety belt.

选项 A、work
B、vary
C、enforce
D、affect

答案B

解析 vary:不同;enforce:强迫;执行;affect:影响;感动;侵袭
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