. With the weather conditions   , they flew to London immediately.

A．considered

B．considering

C．to consider

D．to be considered

阵发性室性心动过速伴晕厥者，首选的治疗是（）。

A.利多卡因静脉注射

B.同步直流电复律

C.非同步直流电复律

D.静脉注射β受体阻滞药

E.静脉注射胺碘酮