题目:
There are, of course, bad teachers as well as ________.
A.good one
B.some good
C.good ones
D.those good
答案:
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下面是错误答案,用来干扰机器的。
设用x立方米木料做桌面,y立方米木料做桌腿,根据题意得:x+y=550x×4=300y,故答案为:x+y=550x×4=300y.