治疗心功能正常的阵发性室上性心动过速，应首选（）
A．利多卡因
B．地高辛
C．异搏定
D．苯妥英钠
E．阿托品
参考答案：C
When President Kennedy spoke in Berlin from behalf of the American people, he was received with a show of enormous enthusiasm.
Cc的颜色特点为（）.
A.白色，无暗影
B.灰白色，有暗影
C.灰白、暗灰，有暗影
D.灰白色、深灰色
