At the wedding, he sang a song specially written for the ____.

A．occasion

B．time

C．moment

D．period

含有儿茶酚胺基团，临床主要用于抗心力衰竭的药物是（）.

A．盐酸哌唑嗪

B．索他洛尔

C．盐酸多巴酚丁胺

D．盐酸普萘洛尔

E．盐酸麻黄碱