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题库 / Prep2007E1-PS-64
If in a certainpopulation, people are born at an average rate of 9 people every 2 seconds andpeople die at an average rate of 3 people every 2 seconds, by approximately howmany people does the population increase in 1 day?
17,280
25,920
129,600
259,200
388,800
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检查了两遍都没发现我少乘了一个0.。。