读风向示意图，当风速稳定后，下列叙述正确的

A．等压线数值①＜②＜③

B．a是地转偏向力

C．此风形成于南半球

D．该风形成于高空

If I _____ you ,I _____ them the story.

A．was , tell

B．were , will tell

C．were ,would tell

D．am. would tell