阿替洛尔( )
A．血管扩张剂B．血管紧张素转换酶抑制剂C．β受体激动剂D．醛固酮拮抗剂E．β受体阻滞剂
以下药物属于哪一类制剂
参考答案：E
The shouting in the classroom suddenly stopped with the ____ of Mr. Black, who preferred silence all the time.
A．appearance
B．movement
C．advance
D．departure
精神生产
