色彩位数（色彩深度）反映了扫描仪对图像色彩的辨析能力。色彩位数为8位的彩色扫描仪，可

某芳香烃的分子式是C₈H₁₀，它的同分异构体共（    ）种。

A．2

B． 3

C． 4

D． 5

回顾历史，我们两国经济和文化的交流已经( )了一千多年。

A．联系

B．继续

C．延续

D．连续

Some people think that they will get ill if they use their brains（大脑）too much.  It is not true.  Through many researches, scientists show us that the more you use your brains, the better they will be, and the wiser you will become.

Of course, if you want to keep your mind clear and be energetic（充满活力的）, you must take a proper rest and study properly.  To the teenagers, using their brains in the morning is good for their health.

There are many ways to rest.  One is a peaceful rest.  Sleep is a peaceful rest.  Another is an active rest.  For example, take a walk outdoors, do morning exercises every day.  To change the way of the brains’activities（活动）is also a good way to rest.

In everyday life, to eat some eggs, meat, fresh vegetable and fruit is also good for the brains.

Wish you a wise man and a happy life.

小题1:If ________________ ,your mind will be clean?

A．You go swimming in a lake

B．You are active in learning

C．You have a good rest and study properly.

D．You can sing a song小题2:Which of the following statements is false?

A．Sleep is a kind of good rest.

B．Doing morning exercises is a peaceful rest.

C．Going out for a rest is an active rest.

D．Different activities are a good rest.小题3:Which of the following is true according to the passage?

A．Illness comes from the fact that the brains are used too much.

B．Fruits are the most important for the brains.

C．The brains will be better if they are used often.

D．Sleep is the only way of having a rest.小题4:Which of the following can be used as the best title of the passage?

A．How to Use your Brain

B．How to Rest

C．How to Become a Wise Man

D．Keep Your Mind Clear

进行HSE管理的目的之一是，（）国家对健康、安全和环境的法律、法规要求。

A、执行

B、满足

C、高于

D、等同于

锅炉超压事故的应急处置行动有哪些？