正确答案: D

普萘洛尔

题目：属于β受体阻断剂的药物是（ ）。

解析：D

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举一反三的答案和解析：

[单选题]She brought with her three friends, none of ______I had ever met before.

whom D． these

[单选题]ESunday is more like Monday than it used to be, Places of business that used to keep daytime “business hours” are now open late into the night. And on the Internet, the hour of the day and the day of the week have become irrelevant (不相关的).A half century ago in the United States, most people experienced strong and precise dividing lines between days of rest and days of work, school time and summer time. Today the boundaries still exist, but they seem not clear.

the line between work time and rest time is unclear

[单选题]萝卜和胡萝卜的肉质直根，红薯和甜菜块根，它们的增粗都是由于形成层和额外形成层共同活动的结果。( )

错误