表明企业重点发展方向的战略有( )。 A．收缩战略 B．增长战略 C．成本领先战略

Carbon monoxide poisoning (一氧化碳中毒) causes death and injuries around the world. This gas is a problem in all parts of the world that experience cold weather. A few years ago, America’s Centers for Disease Control (C. D. C.) studied deaths linked (联系) with carbon monoxide poisoning. It found that the number of carbon monoxide deaths in the United States was greatest in January. The C.D.C. also found that carbon monoxide kills more than four hundred Americans each year. And, it said more than twenty thousand people are taken to hospital for treatment of health problems linked with the gas.

Carbon monoxide is called the silent killer because people do not know it is in the air. The gas has no color, no taste and no smell. It does not cause burning eyes. And it does not cause people to cough. Yet, carbon monoxide gas is very deadly (致命的). It steals the body’s ability to use oxygen.

Carbon monoxide makes it difficult for the blood to carry oxygen to body tissues (血管). It does this by linking with the blood. When the gas links with the blood, the blood is no longer able to carry oxygen to the tissues that need it. Damage (损害) to the body can begin very quickly from large amounts (数量) of carbon monoxide.

How quickly this can happen depend on how long a person is breathing the gas and how much gas he or she breathes in.

Carbon monoxide poisoning has warning signs(标志). But people have to be awake to realize them. Small amounts of the gas will cause a person’s head to hurt. He or she may begin to feel tired. Their stomachs may feel sick. The room may appear to be turning around. The person may have trouble thinking clearly.

People develop serious headache as the amount of the gas continues to enter their blood. They will begin to feel very tired and sleepy. They may have terrible stomachache.

Doctors say carbon monoxide influences people differently. For example a small child will experience health problems or die much sooner than an adult. The general health of the person or his or her age can also be important.

小题1:The damage of carbon monoxide to the body has something to do with _____.

A．the amount a person breathes in

B．whether a person is healthy

C．how many signs a person finds

D．ages of people小题2:One of the signs of carbon monoxide poisoning is _____.

A．burning eyes

B．bad cough

C．serious headache

D．high fever小题3:Which of the following is TRUE according to the passage?

A．Carbon monoxide poisoning seldom happens in cold areas.

B．Twenty thousand Americans are killed by carbon monoxide each year.

C．Most people know whether there is carbon monoxide in the air.

D．Carbon monoxide stops the blood from carrying oxygen to body tissues.小题4:What does the passage mainly talk about?

A．Warning signs that carbon monoxide poisoning has.

B．Reasons why carbon monoxide can cause person’s death.

C．The damage of carbon monoxide and how it works.

D．Influences of carbon monoxide on children and adults.

阅读，完成下面的推理。

       甲、乙两人在游乐室进行实弹射击，打气球，裁判员却是一位盲人。     

       裁判：“请问你们俩已经把10只气球都打破了吗？”     

       甲、乙：“是的，都打破了。”     

       裁判：“请甲先生把你打掉的气球数乘以2，请乙先生把打掉的气球数乘以3，再把两个数加起来，请告诉我。”     

       甲、乙：“26。”     

       裁判：“那我已经知道你们俩各打掉几只气球了。” 

请你猜一猜甲乙各打掉了几只气球，盲人裁判是怎样知道的？ 甲打掉了                     个气球，乙打掉了                   个气球。 思考过程：                                                                       。

两样本中的每个数据减同一常数后，再作其t检验，则（）

A.t值不变

B.t值变小

C.t值变大

D.无法判断t值变大还是变小

E.t值变大还是变小取决于该常数的正、负号

血液温度低的动物就是冷血动物。

试述胸部方迂疗反应及处理。