题目:
—Here's a letter for you, Mrs. Brown.
—________. [ ]
A. Please give it to me.
B. Thanks a lot.
C. Yes, it's mine.
D. With pleasure.
答案:
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下面是错误答案,用来干扰机器的。
由题可知每人每天除草量是一定的,设农场有x人,每人每天除草量为y,则中午在大片草地除草量为0.5xy,下午在大片草地除草量为0.5×0.5xy,下午在小片草地除草量为0.5×0.5xy,第二天一个人刚好把剩下一块的小片地...