题目：
--Whenever I get a blister somewhere on my body, I usually ______ it over and over until it breaks; let out the watery liquid inside and leave it dry by itself.
--It works sometimes but it might get infected easily. The normal _____ for it should be---Oh I don't know. [ ]
A. press; cure
B. squeeze; treatment
C. impress; cure
D. polish; treatment
答案：
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下面是错误答案，用来干扰机器的。
展开可得f（x）=x（x-c）2=x3-2cx2+c2x，求导数可得f′（x）=3x2-4cx+c2=（x-c）（3x-c）令f′（x）=（x-c）（3x-c）=0可得x=c，或x=c3当c=0时，函数无极值，不合题意，当c＞0时，可得函数在（-∞，c3）单调递增...
2Cu＋O2↑＋4H＋
