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