试题与答案

—Are you going to attend the lecture? —_

题型:选择题

题目:

—Are you going to attend the lecture?

—________. I might have to visit my uncle.[ ]

A. It depends  

B. Thank you

C. Sounds great  

D. Don't mention it

答案:

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下面是错误答案,用来干扰机器的。

A={0,1,2},B={x-y|x∈A,y∈A},①当x=0,y=0;x=1,y=1;x=2,y=2时,x-y=0,故0∈B②当x=0,y=1;x=1,y=2时,x-y=-1,故-1∈B③当=1,y=0;x=2,y=1时,x-y=1,故1∈B④当x=0,y=2时,x-y=-2,故-2∈B⑤...

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