For years , many people would not believe that smoke could attack so many parts of the body in so many ways . Study shows , however , that tobacco isn’t one single thing .  At least 60% of it is gas—20 different kinds of gas . And one of these is the deadly carbon monoxide (CO) (一氧化碳).

In factories , the amount of this gas in the air is measured , and it must be kept under fixed , safe level . 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 8000 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 .

1.The gas amount in cigarette smoke is______________.

A.640 times higher than the gas safe levels in factories

B.640 times lower than the gas safe levels in factories

C.640 times as much as that in factories

D.as dangerous as that in factories

2.If you smoke , ______________ .

A.your blood carries more oxygen than is normal

B.your blood carries much more CO than is normal

C.you can have five to ten times of blood than usual

D.your blood will be poisonous

3.Those who smoke______________.

A.all live at sea level

B.don’t live at an altitude of two miles

C.breathe as much oxygen as non-smokers

D.only get the same amount of oxygen at the sea level as non-smokers at an altitude of nearly 2 miles

4.Smokers are______________.

A.easily hurt              B.easily excited      C.easily tired          D.healthy

LONDON (Reuters) ---Organic fruit, carried right to the doorstep. That is what Gabriel Gold prefers , and he is willing to pay for it. If this is not possible, the 26-year-old computer technician will spend the extra money at the supermarket to buy organic food.

“Organic produce is always better,” Mr. Gold said. “The food is free of pesticides(杀虫剂), and you are generally supporting family farms instead of large farms. And more often than not it is locally grown and seasonal, so it is more tasty.” Mr. Gold is one of a growing number of shoppers buying into the organic trend, and supermarkets across Britain are depending on more like him as they grow their organic food business. But how many shoppers really know what they are getting, and why are they willing to pay a higher price for organic produce? Market research shows that Mr. Gold and others who buy organic food can generally give clear reasons for their preferences---but their knowledge of organic food is far from complete. For example, small amounts of pesticides can be used on organic produce. And about three quarters of organic food in Britain is not local but imported to meet the growing need. “The demand for organic food is increasing by about one third every year, so it is a very fast-growing market.” Said Sue Flock, a specialist in this line of business.

1. More and more people in Britain are buying organic food because____________.

A. they are getting richer                 B. they can get the food anywhere

C. they consider the food free of pollution    D. they like home-grown fruit

2. Which statement is TRUE according to the passage?

A. Those who buy organic food have a complete knowledge of organic food.

B. Some of the organic food is produced outside Britain.

C. Organic produce is not seasonal and tastes more tasty.

D. Organic products are those which are free of pesticides.

3. The underlined words “organic trend” means____________.

A. higher prices of organic food    B. better quality of organic food

C. rising market for organic food   D. growing interest in organic food

4. The news story is mainly about____________.

A. that more and more people prefer organic food in Britain

B. the production of organic food in Britain

C. the complete knowledge of organic food in Britain

D. good qualities of organic food in Britain

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