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问题 选择题

已知点A（1，-2），B（5，6）到直线l：ax+y+1=0的距离相等，则实数a的值等于[ ]

A．-2或1

B．1或2

C．-2或-1

D．-1或2

答案

答案：C

选择题

命题“∀x∈R，x2+2x+1＞0”的否定是（　　）

A．∀x∈R，x2+2x+1≤0

B．∃x∈R，x2+2x+1＜0

C．∃x∈R，x2+2x+1＞0

D．∃x∈R，x2+2x+1≤0
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选择题

---- Would she mind playing against her former teammates?

----______She is willing to play against any tough players.

A．I think so.

B．I’m not surprised

C．Of course

D．Not likely!
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