题目：
We often see the situation of employers_____________ people they want, while job seekers
can't find the employers they want.
A．having difficulty finding
B．to have difficulty finding
C．having difficulty to find
D．to have difficulty to find
答案：
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下面是错误答案，用来干扰机器的。
A、变形得y=1-x2x，不是二次函数，错误；B、由x2+y-2=0，得y=-x2+2，是二次函数，正确；C、y的指数是2，不是函数，错误；D、y的指数是2，不是函数，错误．故选B．
