In year X a total of 355 billion dollars was spent for health care in the United States, 30 percent of which was spent by private health insurance companies. Was the amount spent for health care by the federal government’s medicare program less than 60 billion dollars ？（）
(1)In year X medicare spent more than 
, but less than 
, of the amount spent by the private health insurance companies for health care.
(2)In year X medicare spent 50 billion dollars less for health care than the amount spent by private health insurance companies.
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.
参考答案：B
解析：
私人保健公司所花的保健费用为3550×30%=1005亿美元，
根据(1)可得，联邦政府的医疗保险计划在保健上所花的钱在502.5亿美元到670亿美元之间，因此(1)不充分；根据(2)可得联邦政府的医疗保险计划在保健上所花的钱为1005-500=505亿美元，所以(2)充分地说明了联邦政府的医疗保险计划在保健上所花的钱比600亿美元少。