In factories ,the amount of this gas in the air is measured ,and it must be kept under fixed ,safe levels .But there is 640 times this safe amount in cigarette smoke .
Oxygen is carried through your body by the red blood cells .But this poison gas ,CO,will get to the blood cells before the oxygen can .So ,if you smoke your blood carries five to ten times more of this deadly gas than is normal .To make up for this ,your body must make more red cells .
The oxygen in your blood passes into your tissues(组织).But here again CO makes trouble .It keeps the oxygen from passing into your tissues as fast as it should .Because of this ,cigarette country is always about 8 000 feet above sea level .Someone who smokes and lives at sea level gets as little oxygen as a nonsmoker at an altitude (高度)of nearly two miles .
This happens to everyone who smokes ,no matter how old or how young .Anyone who competes in sports can tell you that those who smoke run out of breath more quickly than those who do not .
63.Which of the following statements is true according to the passage ?
A.Many people used to believe that smoke could not attack many parts of the body in many ways.
B.It’s known for years that smoke could attack many parts of the body in many ways .
C.Many people would believe that smoke could attack one part of the body in a certain way .
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