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问题 选择题

已知关于x的一元二次方程mx2+2(m-1)x+m-1的两个实根之积的10倍与两实根平方和的差小于8，则m的取值范围[ ]

A．-1<m≤1

B．-1≤m<1

C．-1<m≤1且m≠0

D．-1≤m≤1

答案

答案：C

选择题

— I’m sorry that I can’t go to your party tonight.

— ________? Haven’t we agreed on it?

A．What is it

B．Why don’t you

C．What do you think

D．How is it
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选择题

—Peter, have you _____your decayed tooth?

—Yeah, but it’s terrible . I had _____most unpleasant time at the dentist’s.

A．pulled out; a

B．cut out; the

C．pulled out; the

D．break out; a
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