inoculate people with viruses, of course. But in an analysis of 1,000 people, the scientists found that those with AD-36 antibodies—a sign that they have been infected—are significantly more likely to be overweight.
3 How could a virus make you fat? When fat cells are exposed to AD-36, they begin to multiply. ―We are not saying all obesity is caused by a virus. Genes, metabolism, and habits all play a role,‖ the scientists acknowledge. ―But at least one other possibility appears to be infection.‖
4 As yet, no one knows how widespread AD-36 may be, or how big a role it might play in the current obesity epidemic. If the scientists‘ suspicions prove correct, the next step would be to develop a vaccine.
31. What is the best title of this passage?
1. Roots of Obesity 2. The Fat Virus 3. Dramatic Weight Gain 4. Obesity in People
32. What is NOT mentioned as a cause of obesity?
1. Genes 2. A virus 3. A vaccine 4. Lifestyle
33. In the passage, what is the alleged ―culprit‖ (paragraph 2)?
1. A bug 2. Obesity 3. An injection 4. An infection