30. Why would the boy hate to be his parents during the festive season? 1. Because he doesn‘t like his parents. 2. Because the Thanksgiving holiday is over. 3. Because his parents are developing a Christmas list. 4. Because he will annoy his parents for 28 days. Passage 1 1 While some researchers search for the roots of obesity in our genes, others investigate infections. Scientists have known for two decades that, surprisingly, certain viruses can cause birds or mammals to become fat. Now scientists think they have tracked down a bug that can cause obesity in people. 2 The alleged culprit is human adenovirus-36, or AD-36. A study published in 2002 showed that AD-36 injected into monkeys causes dramatic weight gain. In some animals, the injected virus caused body fat to triple. It‘s unethical to