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问题 单项选择题

以下关于乙酰胆碱受体的表述，错误的是

A．乙酰胆碱受体主要可分为两类
B．M乙酰胆碱受体对毒蕈碱敏感
C．N乙酰胆碱受体对烟碱敏感
D．M乙酰胆碱受体可分为M1、M2两种亚型
E．N乙酰胆碱受体可分为N1和N2两种亚型

答案

参考答案：D

单项选择题

In the dining room of my grandfather’ s house stood his heavy clock. Meals in the dining room were a (21) for our four generations to become one. My grandfather’ s clock always stood like a trusted old family friend, (22) us playing jokes and tellingstories, which was already a (23) of our life.

When I was a child, the old clock interested me. I watched and listened to it during (24) I was surprised how at (25) times of the day, the clock would strike three times, six times or more, with a wonderful great (26) that echoed throughout the house. The clock chimed year after year, a part of my (27) , a part of my heart.

Even more (28) to me was my grandfather’s special action each day. He meticulously (29) the clock with a special key each day. The key was magic to me. It (30) our family’ s magnificent clock ticking and striking all year round.

23（）

A.opened 

B.wound 

C.turned 

D.started
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名词解释

塑性断裂
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