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【单选题】
设 P : 2 + 2 = 4 , Q : 3 + 3 = 6 ,命题 “ 若 2 + 2≠4 ,则 3 + 3≠6 ,反之亦然。 ” 的符号化表示为【 】。A.
P ∨ Q
B.
P à Q
C.
┐ P « ┐ Q
D.
P « Q
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【多选题】E There are two days we shouldn’t worry about in our life. One is yesterday, 4 6 . Yesterday is gone forever. 4 7 . So it is useless to worry about it. We cannot control tomorrow. 4 8 , maybe somethin...
A.
We cannot change what you said or what you did yesterday
B.
We don’t know what will happen next day
C.
Yes, it is Today
D.
because it is our wealth in our hand
E.
and the other one is tomorrow
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