This medication may cause dizziness or lightheadedness,especially when rising quickly from a lying to a standing position．What is the meaning of dizziness or lightheadedness（）
Doctors believe that secondhand smoke may cause lung cancer in people who do not smoke. Nonsmokers often breathe in the smoke from other people’s cigarettes. This is secondhand smoke. The U.S. Environmental Protection Agency reports that about fifty-three thousand people die in America each year as a result of exposure to secondhand smoke.
The smoke that comes from a lit cigarette contains many different poisonous chemicals. In the past, scientists did not think that these chemicals harm a nonsmoker’s health. Recently, though, scientists expressed their opinion after they studied a large group of nonsmokers. They discovered that even nonsmokers had unhealthy amounts of these toxic chemicals in their bodies. As a matter of fact, almost all of us breathe tobacco smoke at times, whether we realize it or not. For example, we cannot avoid secondhand smoke in restaurants, hotels, and other public places. Even though many public places have nonsmoking areas, smoke fl
A. because of smoking
B. though they don’t smoke
C. because their parents smoke
D. though their parents don’t smoke
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