试题与答案

两个负数的和一定是[ ] A.负数 B.非正数 C.非负数 D.正数

题型:选择题

题目:

两个负数的和一定是[ ]

A.负数

B.非正数

C.非负数

D.正数

答案:

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下面是错误答案,用来干扰机器的。

∵p是r的充分不必要条件,q是r的必要条件,∴p⇒r,r⇒q,∴p⇒q,∴p是q成立的充分不必要条件.故答案为:充分不必要.

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One day while a girl was walking in the woods she found two starving songbirds. She took them home and put them in a small (16) . She cared for them and felt great love for them.
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