康龙自然保护区是“国家级自然保护区”。

Speaker A: If I were you, I'd ride a bike to work. Taking a crowded bus during rush hours is really terrible.Speaker B: ______

A．Yeah, riding a bike is a healthful activity. Don't you think

B．Yes, you're right. Buses are always very crowded during the rush hours.

C．Thank you for your advice. But my bike has got a flat tyre.

D．Certainly. I don't see Why so many people go to work by bus rather than by bike.

放在水平桌面上的三只完全相同的杯子里盛有水，分别放入质量相等的铁、铝、铜块之后，水面相平，根据这一现象可以判定原来盛水最多的杯子是[ ]

A．放铜块的杯子

B．放铁块的杯子

C．放铝块的杯子

D．三只杯子的水一样多

下列与原发性支气管癌发病无关的因素是（）

A.吸烟

B.空气污染

C.职业危害

D.肺结核

E.急性上呼吸道感染

CPU通过接口电路向液晶显示器输出数据时，在接口电路中()。

A．数据可以直接输出到显示器

B．数据只需经过三态门输出到显示器

C．数据经反相器后输出到显示器

D．数据经锁存后输出到显示器

简述直接传授培训方式的具体形式。