考研英語聽力基本功訓(xùn)練1: Passage21

It is estimated that smoking kills over 300 000 people in the U.S.every yea

Smoking is the largest preventable cause of premature death and disability in the U.S

One out of six deaths in the U.S.every year is a result of cigarette smokin

In the U.S.,about 23 billion dollars are spent in medical costs from the effects of smokin

Over 30 billion dollars are lost because of loss of working time and decreased productivity because of smokin

The serious diseases most frequently caused by smoking ar

lung cancer (the risk of smokers is 10 times greater than for nonsmokers

chronic bronchitis heart attack,stroke(the risk for smokers is almost 3 times greater than for nonsmokers

heart pains,and leg pain

It is never too late to quit smokin

Two years after stopping,your risk of heart attack returns to averag

After 10 years,your risk of lung cancer is back to nearly norma

After 2 years,there is a decrease in lung cancer risk by about one-third.