心悸包括两类，____者，无时而作者是也；____者，有时而作者是也。
参考答案：怔忡；惊悸
It is high time we ______ awareness of environmental protection.
A．promoted
B．would promote
C．shall promote
D．had promoted
请列举常用的直线段裁减算法（四种）？
