问题
单项选择题
The chart above shows how Jeff spent his earnings for one year. How much did Jeff spend for clothing ?()
(1)He spent $18 during the year on tennis balls.
(2)He spent $190 during the year on recreation
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:
从图中可以看出,Jeff在衣服上的开支占他这一年总收入的26%,因此只要能求出总收入是多少,就可以求出他在衣服上所花钱的多少。(1)明显不充分,因为它与图中的数据联系不起来,从而也无法求出Jeff在衣服上所花的钱是多少;(2)充分,因为根据娱乐的开支是190美元,以及它占总开支的20%,很容易求出他的总支出是190÷20%美元,所以他在衣服上的支出是190÷20%×26%=247美元。