John goes to school ______ his friends' car. [ ]
A. by
B. in
C. at
D. on
答案：B
风湿热出现心力衰竭时，洋地黄剂量应为一般剂量的（）
A.1倍
B.2倍
C.1/2~1/3
D.3/4
E.相同
乌鸡白凤丸具有的功效是（）
A.养血调经．暖宫止痛
B.补气养血，调经止带
C.养血补气，调经止痛
D.开郁顺气，调经养血
