问题 单项选择题

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.

A.条件(1)充分,但条件(2)不充分.

B.条件(2)充分,但条件(1)不充分.

C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.

D.条件(1)充分,条件(2)也充分.

E.条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.

答案

参考答案:B

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。

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单项选择题