阅读理解
单选题
It is easy to determine whether smoking is hazardous.
单选题
Smoking reduces one’s life expectancy.
单选题
Smoking may induce lung cancer.
单选题
There is evidence that smoking is responsible for breast cancer.
单选题
Male smokers have a lower death rate from heart disease than female smokers.
单选题
Nicotine is poisonous
单选题
Filters and low tar tobacco make smoking safe.