单选题 If the price of potatoes is $0.20 per pound, what is the maximum number of potatoes that can be bought for $1.00?
(1)The price of a bag of potatoes is $2.80.
(2)There are 15 to 18 potatoes in every 5 pounds.

【正确答案】 B
【答案解析】[解析] 因为不知道1袋土豆有多少个,所以无法求出1美元能买多少个土豆,因此(1)不充分;1美元可以买5磅土豆,根据(2)可得每5磅土豆有15到18个,所以1美元最多可以买18个土豆,因此(2)是充分的。