2. 外语
  3. A package is never accepted for delivery by the delivery service unless it is within the established size limits. All packages a

A package is never accepted for delivery by the delivery service unless it is within the established size limits. All packages a

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问题 A package is never accepted for delivery by the delivery service unless it is within the established size limits. All packages accepted for delivery by the delivery service have a return address. If the statements above are true, which of the following must also be true?
选项 A、The delivery service charges more for heavier packages than for lighter packages.
B、The delivery service will always accept for delivery a package that is within the established size limits.
C、If a package is within the established size limits and has a return address, it will be accepted for delivery by the delivery service no matter how heavy the package is.
D、A package that is not within the established size limits but has a return address is never accepted for delivery by the delivery service.
E、The delivery service does not charge for packages that must be returned to the sender.
答案D
解析 若用B表示包裹被接受投递，A1表示在规定的尺寸之内，A2表示有退回地址，那么段落推理模式为B→A1A2，其逆否命题为，其含义为都能导致，所以(D)正确；(C)易误选，但(C)明显是把必要条件混为充分条件，所以(C)不对；(A)、(D)中的“charge”在上面段落中没有出现；(B)中的always为段落中没有出现的绝对化语言，因此也不对。
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