急性心肌梗死时出现的室性心律失常，首选用药是
A.利多卡因
B.洋地黄
C.普罗帕酮
D.异搏定
E.美托洛尔
参考答案：A
Study hard, _______ you will fall behind the others.
A. and B. but c. or D. though
