If A, then B.
If B, then C.
If C, then D.
If all of the statements above are true, which of the following must also be true?
(A) If D, then A.
(B) If not B, then not C.
(C) If not D, then not A.
(D) If D, then E.
(E) If not A, then not D.
这种类型的题目的中文表述应该是怎么样的呢?
c is true
it's too obvious
如果有A ,就有B, 或者如果A 存在,B 就存在。
A-------B (A 推出B)
B-------C 则A ------C
C--------D A-------D
A 推出D 逆否:非D------非A
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