Which of the following is tree according to the first paragraph? Which statement can be inferred from the second paragraph?

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问题 Which of the following is tree according to the first paragraph?
Which statement can be inferred from the second paragraph?

选项 A、It’s impossible that a two-hour gap between the incident at the dorm and another one across campus.
B、More than one gunman was involved.
C、The gunman was an Asian man.
D、One of high school’s ways of keeping security is using a metal detector or two.

答案D

解析 依照题目可直接锁定第二段。Unlike high schools, most universities can’t beef up security with a metal detector or two...Why was there a two-hour gap between the incident at the dorm and a far more fatal one across campus? At one point, that led to theorizing that more than one gunman was involved. The gunman...was described by some sources as an Asian man.由第一句话"与中学不同,大多数大学不可能用一两个金属检测器来提高安全性"可知用一两个金属检测器来提高安全性是大多数中学采用的安全措施之一,故D正确。第四句对宿舍枪杀事件和校园里的另一起命案两个小时的时间间隔表示了怀疑,但这并不能确定地说这是不可能发生的。故A不对。C说法太绝对,袭击者只被some sources描述成"an Asian man",消息是从某些渠道得来的,并非确定结果。B也只是推测的结论,所以也不正确。
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