用恰当的介词填空。

1. My father often wakes up _______ 5:00 am.

2. The girl _______ red is my English teacher's daughter.

3. Mary comes _______ New York.

4. Some boy students are taking part _______ a speech contest.

5. Tom is very good _______ math.

钙拮抗剂不具有下列哪项作用

A．负性肌力作用

B．负性频率作用

C．负性传导作用

D．舒张动脉血管

E．收缩支气管平滑肌