问题 单项选择题

某工程方案设计生产能力12万吨/年,单位产品售价(不含税)510元/吨,总固定成本1500万元,单位成本250元/吨,并与产量成正比关系,则以产量表示的盈亏平衡点为( )吨。

A.2.94×104
B.5.77×104
C.6.00×104
D.1.25×106

答案

参考答案:B

阅读理解

阅读理解。

     Jackie Joyner-Kersee had a serious asthma attack while running a race at the 1994 U. S. Olympic Festival.

     "I wasn't afraid of running; I was afraid I might die," said Joyner-Kersee. "I said 'Don't be afraid. . . just

hold on."

     So, what is asthma? It's a health condition that causes difficulty in breathing. Although it comes and goes,

once you have asthma, you have it for a long time. Different treatments are used for asthma. There are very

strong drugs that can be taken for a long time with few side effects. Today, even people with serious asthma

can take part in sports.

     Joyner-Kersee has had problems with asthma for many years. She said, "I didn't have this as a little girl.

It wasn't until I went to California that I noticed it, and then I didn't want to accept it. When I start feeling

good, I stop taking the medicine. It will be all right. . . . I hope. "

     The race was supposed to start at.5:35 p. m. At 5:00, she began to have trouble breathing. She was

given a breathing test and treatment by a doctor. She said she thought about not running. She was out of

breath.

     "It's just hard running with asthma," she said. "When I experienced this in practice. I couldn't breathe.

It was really hard for me. " She said the problem with asthma is that you don't know when it will happen.

She was fine when she arrived at the stadium. The breathing treatment helped her. Joyner-Kersee's experience

shows that medical treatment is important. First, if you think you have asthma, see a doctor. Asthma drugs

can protect your lungs. Second, pay attention to your health. Tell your doctor immediately if you wake up and

have trouble breathing. This means the condition is getting worse. Many people don't want to be known to

have asthma, and then they must go to the hospital.

     Most importantly, remember that with asthma, you can have a normal life. You can even win an Olympic

gold medal.

1. Did Jackie Joyner-Kersee run at the 1994 U. S. Olympic Festival? 

   _________________________________________________________________

2. What is asthma? 

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3. When did Joyner-Kersee first find she had asthma?

   _________________________________________________________________

4. How can you tell your asthma is getting worse?

   __________________________________________________________________

5. What do you think is the writer's purpose of writing the passage? 

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