.

I like skating very much. ___________tomorrow, we could enjoy this thrilling sports as much as we can together.

A．If it snows

B．Would it snow

C．Were it to snow

D．It should snow

有助于确诊肺栓塞的可靠的检查方法是（）

A.血气分析

B.D-二聚体检测

C.心电图

D.X线胸片

E.放射性核素肺灌注扫描