用煤火取暖或使用燃气热水器冲凉，都可能发生煤气中毒的悲剧，请

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问题填空题

用煤火取暖或使用燃气热水器冲凉，都可能发生煤气中毒的悲剧，请回答：

（1）煤气的有毒成份的化学式是______．

（2）煤燃烧时产生煤气的条件是______．

（3）煤气使人中毒的生理过程是______．

答案

（1）煤的燃烧会产生一氧化碳和二氧化碳等气体，二氧化碳无毒，一氧化碳会使人中毒，故答案为：CO，

（2）碳在充足的氧气中燃烧生成二氧化碳，在不充足的氧气中燃烧产生一氧化碳，既然生成了一氧化碳，说明氧气不足，故答案为：氧气不足，

（3）一氧化碳中毒后，是人体血液中的亚铁离子转化为铁离子，铁离子没有携氧能力，故答案为：CO与人体内的血红蛋白结合，使其失去载氧能力，

完形填空

Several months ago I was involved in a car accident. That moment     my views on life.
All my life I had been waiting    I could get my driver’s     and my first car. When I    got my license and my dad brought the car to the house, I felt very    . From that day on, the most     thing in my life was that car. Every day I would get home and      what else I could do to make it better. My car was my    and joy and when I had fixed it up into “perfect” condition, I finally began to     it. Every time I got into my car I felt the greatest,     nothing could stop me, but one day I was     that just like any other person, I could be broken.
One night, though it was too     outside to see clearly, I was in the     with my friends. I felt unstoppable while driving,     soon enough I was shown that I wasn’t. While driving down a main street I felt I was     the car. It was flying. When I     what was happening, the only thing I could do was protect my friends from being hurt badly.
After the accident I don't remember much, but I do remember the     I was in, not only physical but also the thought that the lives of others were     for a few seconds and I may have dropped them. The memory of that day will never     me. I learned that material things should     be the most important things in your life. I also learned that I need to appreciate the things and people around me.

A．taking advantage of	B．losing control of
C．making use of	D．putting an end to

C．beyond my imagination

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选择题

航天科技测知金星大气层中的某种气体由碳、氧两种元素组成，且碳元素的质量分数是 52.94%，则该气体的化学式为

A．CO

B．CO₂

C．C₃O₂

D．C₂O₃

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