吸烟对牙周组织的危害有哪些?

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问题:

吸烟对牙周组织的危害有哪些?

考点:保健知识竞赛保健知识竞赛题库
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我国某出口外向型企业生产某种商品的成本为人民币30元/件,在国际市场上,1美元=7元人民币,按6美元/件的价格出售商品;一年后,美元兑换人民币的汇率下跌l0%,其他条件不变,为保持相同的价格和利润水平,该企业要将成本控制在:  

A.37.8元/件

B.25.8元/件

C.34.2元/件

D.20元/件

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成人生命体征测量值,在正常范围内的一组是

A.T37℃ P102次/min R22次/min BPl6/10kPa

B.T38℃ P98次/min R24次/min BPl5/9kPa

C.T36.8℃ P88次/min R20次/min BPl7/1lkPa

D.T35.8℃ P58次/min R15次/min BPl4/8.5kPa

E.T36.5℃ P70次/mtn R18次/min BPl9/13kPa

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计算机网络系统与分布式系统之间的主要区别在于

A.服务器类型

B.系统的物理结构

C.系统高层软件

D.传输介质类型

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阅读理解

     I told my friend Graham that I often cycle two miles from my house to the town centre but

unfortunately there is a big hill on the route. He replied, "You mean fortunately." He explained

that I should be glad of the extra exercise that the hill provided.

     My attitude to the hill has now changed. I used to grumble as I approached it but now I tell

myself the following. This hill will exercise my heart and lungs. It will help me to lose weight and

get fit. It will mean that I live longer. This hill is my friend. Finally I comfort myself with the thought

of all those silly people who pay money to go to a gym and sit on stationery exercise bicycles when

I can get the same value for free. I have a smile of satisfaction as I reach the top of the hill.

     Problems are there to be faced and overcome. We cannot achieve anything with an easy life.

Helen Keller was the first deaf and blind person to gain a university degree. Her activism and

writing proved inspirational. She wrote, "Character cannot be developed in ease and quiet.  Only

through experiences of trial and suffering can the soul be strengthened, vision cleared, ambition

inspired and success achieved."

     One of the main determinants of success in life is our attitude towards adversity (逆境). From

time to time we all face hardships, problems, accidents,  afflictions and difficulties. Some are of

our making but many confront us through no fault of our own.  While we cannot choose the

adversity we can choose our attitude towards it.

     Douglas Bader was 21 when in 1931 he had both legs cut off following a flying accident. He

was determined to fly again and went on to become one of the leading flying aces in the Battle of

Britain with 22 aerial victories over the Germans. He was an inspiration to others during the war.

He said, "Don't listen to anyone who tells you that you can't do this or that. That's nonsense.

Make up your mind, you'll never use crutches (拐杖) or a stick, then have a go at everything. Go

to school, join in all the games you can. Go anywhere you want to. But never, never let them

persuade you that things are too difficult or impossible."

     The biographies(传记)of great people are full of examples of how they took steps to overcome

the difficulties they faced. The common thread is that they did not become depressed. They chose

their attitude. They chose to be positive. They took on the challenge. They won.

     Nevertheless, there is still the problem of how you change your attitude towards adversity.

1. Which of the following is TRUE according to the author of the  passage?

A. Climbing hills on bicycles is the best way to take exercise.

B. People are silly to pay to go to the gym.

C. Those who want to achieve success can't expect to live         an easy life.

D. People's attitude towards adversity is the only factor that determines whether they will succeed.

2. By quoting what Douglas Bader said, the author intends to  tell us "________".

A. Failure is the mother of success.

B. A fall into the pit, a gain in your wit.

C. If you venture nothing, you will have nothing.

D. Nothing is difficult to the man who will try.

3. Following this passage, the author will further talk about ________.

A. how his friend helped him to change his attitude towards  the adversity he faced

B. what steps to take to change your attitude towards the  adversity you face

C. what great people have in common

D. why it is important to keep optimistic in face of adversity

4. Which of the following can best function as the title of the  passage?

A. Face Adversity with a Smile

B. Different Attitudes towards Adversity

C. Nothing is Impossible

D. Life Is Full of Adversity

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天然喷泉多为间歇性的热水泉。

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