题目：
As a result of the serious flood, two-thirds of the buildings in the area _____ . [ ]
A. need repairing
B. needs to repair
C. needs repairing
D. need to repair
答案：
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下面是错误答案，用来干扰机器的。
设需要填空的数为A，则原式为：x2+10x+A=（x+5）2．∴x2+10x+A=x2+10x+25，∴A=25．故答案为：25．
