— It’s getting dark earlier than before, isn’t it?

— Yes. I think so. I see ____ is on already.

A．the street’s light

B．the light of the street

C．the streets’ light

D．the street light

可用于房室传导阻滞的药物是（）。

A.肾上腺素

B.异丙肾上腺素

C.去甲肾上腺素

D.间羟胺

E.麻黄碱