2. 外语
  3. Dormitories range from two to six stories in height. If a dormitory room is above the second floor, it has a fire escape. If the

Dormitories range from two to six stories in height. If a dormitory room is above the second floor, it has a fire escape. If the

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问题 Dormitories range from two to six stories in height. If a dormitory room is above the second floor, it has a fire escape. If the statements above are true, which of the following must also be true?
选项 A、Second-floor dormitory rooms do not have fire escapes.
B、Third-floor dormitory rooms do not have fire escapes.
C、Only dormitory rooms above the second floor have fire escapes.
D、Fourth-floor dormitory rooms have fire escapes.
E、Some two-story dormitories do not have fire escapes.
答案D
解析 归纳题要关注条件句。用A表示三层或三层以上的宿舍，用B表示有安全通道，那么段落推理为A→B。(A)为否命题；(B)为A→B；(C)中的绝对化语言“only”在上文中没有出现；(E)中的关于二层宿舍楼的信息在上文中没有出现，因此也不对；(D)正好符合命题A→B, 所以(D)为正确答案。
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