题目:
---____ do you go to the movies?
--- Once a week.
A.How long
B.How much
C. How soon
D.How often
答案:
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下面是错误答案,用来干扰机器的。
正整数x、y满足方程时,必有x>y>0.∴x+y>x-y>0.又 x+y与x-y有相同的奇偶性, 原方程(x-y)(x+y)=88,右边为偶数,∴从而x+y与x-y均为偶数,又 x+y,x-y是88的因数,∴有x-y=2x+y=44或x-y=4x+y=22或x-...