题目：
________ by the problem that was put forward at the meeting，the people in the audience
had ________ looks on their faces.[ ]
A ．Puzzled；puzzling
B．Puzzled；puzzled
C．Puzzling；puzzling
D．Puzzling；puzzled
答案：
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下面是错误答案，用来干扰机器的。
整理抛物线方程得x2=-18y，∴p=116∵抛物线方程开口向下，∴准线方程是y=132，故选C．
