－It’s necessary to limit the speed of electric bikes.

－Yes, most riders of electric bikes in China        40-50 kilometers per hour often ignore red lights,        the risk of traffic accidents.

A．reaching; increase

B．reach; increase

C．to reach; to increase

D．reaching; increasing

不符合阵发性心动过速的特点的是（）

A.阵发性快速而规则的异位心律

B.由3个或3个以上连续发生的期前收缩形成

C.具有突发、突止的特点

D.根据异位节律点的部位不同分为房室性和室性两类

E.心律基本规则