根据以下材料，回答题Every day 25 million U.S. children fideschool buses. The safety record for these buses is much better than forpassenger cars; but nevertheless, about 10 children are killed each year ridingon large school buses, and nearly four times that number arc killed outsidebuses in the loading zones. By and large, however, the nation′s school childrenare transported to and from school safety.Even though the number of school buscasualties (伤亡事故) is not large, the safety of children is always of intense publicconcern. While everyone wants to see children transported safely, people aredivided about what needs to be done particularly whether seat belts should bemandatory (强制).Proponents of seat belts on schoolbuses--many of them parents and medical organizations argue that seat belts arcnecessary not only to reduce fatality and injury, but also to teach children lessonsabout the importance of using them routinely in any moving vehicle. A sidebenefit, they point out, is those seats belts help keep children in theirseats, away from the bus driver.Opponents of seat belt installation suggestthat children are already well protected by the school buses that adhere to theNation Highway Traffic Safety Administrations (NHTSA) safety requirements setin 1977. They also believe that many children won′t wear seat belts anyway andthat may damage the belts or use them as weapons to hurt other children.A new Research Council report on school bussafety suggests that there are alternate safety devices and procedures that maybe more effective and less expensive. For example, the study committeesuggested that raising seat backs four inches may have the same safetyeffectiveness as seat belts.The report sponsored by the Department ofTransportation at the request of Congress, reviews seat belts extensively whiletaking a broader look at safety in and around school buses. The title below which best expresses theidea of the passage is______.查看材料
A.Making School Buses Even Safer forChildrenB.Seat Belts Needed on School BusesC.Alternate Safety Devices and ProceduresD.Safety in and around School Buses

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• 按事故后果的严重程度可分为（）。

  A．轻伤事故、重伤事故、死亡事故、特大伤亡事故、超大伤亡事故

  B．死亡事故、重伤事故、重大伤亡事故、超大多伤亡事故

  C．轻伤事故、重伤事故、死亡事故、重大伤亡事故以及急性中毒事故

  D．微伤事故、轻伤重放、死亡事故、重大伤亡事故、急性中毒事故等

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• 伤亡事故统计分析方法是以研究伤亡事故统计为基础的分析方法，伤亡事故统计有描述统计法和推理统计法两种方法。其中（）能够直观地反映不同分类项目所造成的伤亡事故指标大小比较。A算数分析法B相对指标比较法C柱状图D排列图

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• 按照《企业职工伤亡事故分类标准》，该事故属于()。

  A．死亡事故

  B．重大伤亡事故

  C．特大伤亡事故

  D．特别重大伤亡事故

  此题为多项选择题。

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• 一次造成职工和居民100人及其以上的急性中毒事故属于（）。

  A.特大伤亡事故

  B.急性中毒事故

  C.重大伤亡事故

  D.特别重大伤亡事故

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• 重大人身伤亡事故是指一次事故死亡3人及以上，或一次事故死亡和重伤10人及以上的人身伤亡事故;特大人身伤亡事故是指一次死亡10人及以上，或一次死亡、重伤20人及以上的人身伤亡事故。()

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