1,DS 有个表格,一个商店 卖东西,2-20元,11人,20-40元9人,。。。80-100元,9人, 问 RANGE 是否低于90,就是买的最贵的的跟买的最便宜的差多少钱是否低于90 1 买最贵的91 2 买最便宜的12 选D 91-2=89 100-12=88 This is the only problem that I have a different answer from yours. 1: do not know the lowest price; could be 2, or 5,8, as long as it is in the 2-20 range 2: do not know the highest price; could be 80,90,100, as long as it is in the 80-100 range (1)+(2): know the highest and lowest; so the range is 91-12=79 so the answer should be C
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