—Americans spend more on health care than most other people .

— You’re right . But a new study shows that life      in the United States is falling .

A．development

B．position

C．experience

D．expectancy

麻黄发汗解表，入汤剂的用法是

A．后下
B．不宜久煎
C．包煎
D．冲服
E．先煎