老师:想要一套较全的时事政治资料。谢谢!

2012-04-06 21:26 来自版块 - 

老师:命题的否定是不是只否定结论?如:命题“存在x属于R,使得x^2+2x+5=0"的否定是( )A:存在x属于R,使得x^2+2x+5不等于0.B:对任何x属于R,都有x^2+2x+5不等于0.

2011-08-18 23:32 来自版块 - 

( )I really don't like art, I find his work impressive. A.As B.Since C.If D.While问:选A还是选D? why?

2011-08-09 20:16 来自版块 - 

老师首先谢谢上次回复我的问题

2011-07-07 20:54 来自版块 - 

一。Who is the man who has on ablue coat? 从句中的who 是不是得换成that 为什么?二。It is the one of the best TV plays that have been sho... 全文

2011-07-01 13:27 来自版块 - 


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