何谓"四气"？四气是如何确定的？举例说明。

阅读理解。

     A young lady was on holiday in Brighton. One day, she went into a bank to get some money. It had been

sent there for her from the town where she lived.

     The clerk (职员) in the Brighton bank did not know her, so he said, "What proof (证明) have you got that

you are really the lady who should get this money?"

     The young lady looked worried for a few moments and said, "I don't think I've brought any proof with me,"

but then she suddenly looked happy again. She opened her bag, took a photo of herself out of it and showed it

to the clerk. "Here's something," she said.

     The clerk looked at the photo carefully and then looked at the young lady. "Yes, that's you," he said, and paid

the money to her without any more trouble.

1. Where did the lady live?

A. In a town.

B. In Brighton.

C. In a bank. D. In a city.

2. Why did the lady feel worried when she was at the bank?

A. Because she didn't know the clerk.

B. Because she was far way from home.

C. Because she had spent all her money.

D. Because she couldn't prove who she was.

3. From the passage we can see that the clerk was ______.

A. silly

B. kind

C. clever

D. impolite

心肌传导功能异常的表现形式包括()

A.完全性传导阻滞

B.传导延迟

C.单向阻滞

D.折返激动

E.隐匿性传导

如图所示，竖直向上的匀强电场中，绝缘轻质弹簧直立于地面上，上面放一个质量为m的带正电的小球，小球与弹簧不连接．现将小球向下压到某位置后由静止释放，若小球从静止开始运动到离开弹簧的过程中，重力和电场力对小球做功的大小分别为W₁和W₂，小球离开弹簧时速度为v，不计空气阻力，则上述过程中

A．带电小球电势能增加W₂

B．弹簧弹性势能最大值为W₁＋mv²

C．弹簧弹性势能减少量为W₂＋W₁

D．带电小球和弹簧组成的系统机械能增加W₂

下列是高血压、冠心病的独立危险因素的是（）

A.发作性睡病

B.睡眠呼吸暂停综合征

C.原发性鼾症

D.血脂异常

E.吸烟

根据《建筑施工工具式脚手架安全技术规范》，对于外挂防护架的构造，说法正确的是（）

A.架体高度不得大于13.5m

B.架体宽度不得超过1.2m

C.纵向水平步距不得大于1M

D.架体长度不得超过6m