According to the passage, an epidemic of violence in American classrooms was inevitable in that ______. Why did FBI deem it imp

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问题 According to the passage, an epidemic of violence in American classrooms was inevitable in that ______.
Why did FBI deem it impossible to produce a useful profile of a possible shooter?

选项 A、Because the occasional behavior on a checklist of warning signs cannot be proof of an adolescent’s violent inclination.
B、Because not all the shooters show violent behavior in their daily life.
C、Because the Columbine massacre in 1999 did not give us anything new or valuable.
D、Because the school shooters do not have anything in common.

答案A

解析 本题测试的是考生对文章最后一段内容的理解。After...It concluded that...because "a great many adolescents who will never commit violent acts will show some of the behaviours on any checklist of warning signs".FBI在对校园枪击案的报告中指出,"很多永远不会有暴力行为的:青少年也会有某些越界行为"。因此,不能凭借一个人某些应受到警告的表现,就断定他会成为枪击者。所以A选项正确。B选项是将A选项反过来说,但并不是FBI报告中的确切说法,因此B选项错误。C选项中的几个重点词(Columbine massacre,new or valuable)都在上面两句话中出现过,但与不能从外在表现判断一个人是否会成为凶手的原因无关。因此C也错误。D选项在文章中没有谈及,属于主观猜测,故错误。
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