根据句意及汉语提示完成句子。

1. We must obey the traffic _____ (规则).

2.They often go out for a walk by the _____ (小溪).

3. It's too dark outside.I can't see the blackboard _____ (清晰地).

4. Has anyone got any _____ ( 建议) for how to solve the problem?

5. You _____ (一定不能) laugh at the people in trouble.

6. Maybe the little boy is _____ (非常饿的). Pass him a piece of bread.

7. The _____ (绳子) was not strong enough, so we must change it.

关于二尖瓣狭窄的论述错误的是

A．中度以上狭窄心浊音界可呈梨形

B．听诊心尖区S1减弱

C．触诊心尖区常有舒张期震颤

D．视诊可见二尖瓣面容

E．听诊在心尖区可闻及低调、隆隆样、舒张中晚期杂音