今天第一次开怀大笑,放松情绪。
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This year, a milky cow produces 770 gallons of milk; 6 years ago, the same cow milked 680 gallons; now
the question: whats the average number of gallons does this cow sqeeze its own milk every day?
支持楼主!
呵呵...气氛真是满有意思的
不错不错
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