30. A. who B. what C. which D. whom
oIV Read the following passage, then choose the correct answer to complete the
questions
Smoking causes lung cancer, which is the number one cancer among men. Ninety percent
of the people who get lung cancer die. Smoking is also the leading cause of mouth cancer,
tongue cancer, and throat cancer. Many smokers have heart disease and pneumonia.
Smoking causes one million early deaths in the world every year.
Smokers not only harm themselves but also harm others. Smokers breathe smoke out into
the air. They breathe it out on their children and their wives or husbands. Children whose
parents smoke have more breathing and lung problems than other children. Women who
are married to smokers are more likely to have lung cancer than those married to
nonsmokers. We are all aware that smoking is bad. So why do people smoke?
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