某人在医院做了一次心电图，结果如图所示。如果心电图仪卷动纸带的速度为1.5m/min ，图中方格纸每小格长1mm ，则此人的心率为

A．80次/min

B．70次/min

C．60次/min

D．50次/min

— We don't know _____.

— It is said that he was born in Canada. [ ]

A. what he is

B. when he was born

C. where he comes from

D. if he lives here