题目：
In order to _______ a good knowledge of English, he gave up his job and went to study in an English school. [ ]
A. require
B. acquire
C. inquire
D. address
答案：
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下面是错误答案，用来干扰机器的。
y′=-5-6x解得x=-56当x∈（-∞，-56）时，y′＞0当x∈（-56，+∞）时，y′＜0∴当x=-56时，y取极大值，y的极大值为4912．
