C. his face looks pale
D. he is standing
5.In this passage, the writer explains________.
A. why people faint and how we help them
B. when people faint and when we help them
C. why people faint and where we help them
D. how people faint and why we help them
B
How long can a person live without breathing? Probably for only four to six minutes. The air we breathe in supplies the oxygen(氧) that is necessary for keeping every part of the body alive. And the brain, which itself controls breathing, is the first to suffer(受苦) if oxygen is lacking(缺乏). If no air enters the lungs(肺), the heart will continue to beat for a little longer, supplying the blood to the brain and other parts of the body. But soon, the supply of oxygen already in the blood is used up.
First, the patient loses conciousness(知觉), because the brain is no longer getting enough oxygen to work. Then lack of oxygen in the heart causes it to stop beating. Without oxygen ,the brain can survive(持续) undamaged for only about four minutes. The heart may survive for as long as 12 minutes. But within six minutes the person will almost certainly be dead.
1.The oxygen that our body needs comes from________.
A. the air we breathe in B. the moving blood
【2010年高考英语阅读理解专项复习题10】相关文章:
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