2. What’s Michelle’s impression of the people in Los Angeles?

　　A. They get angry easily.

　　B. All sorts of people live there.

　　C. They are patient and amusing.

　　D. Everyone is kind and beautiful.

　　3. How does Michelle find Los Angeles?

　　A. Safe but noisy.

　　B. Relaxing but busy.

　　C. Polluted and dangerous.

　　D. Diverse and interesting.

　　B

　　Now, we know that if we do not get enough vitamins, we are at risk of developing a number of diseases. As a result, vitamin supplements（补品），though expensive, are popular with people who worry that they are not getting enough vitamins from the foods they eat. But contrary to what many people think, medical experts have found little evidence that most supplements do anything to improve health or protect against disease. $

　　In fact, medical experts warn that taking too many of some vitamins can be harmful. For example, too much vitamin E can cause bleeding. People should discuss what vitamins they take with their doctors, as some vitamins can produce harmful side effects when mixed with medicines.

　　Experts, however, say that sometimes vitamins can help prevent disease. People who know they lack a particular vitamin should take vitamin supplements. Some older adults, for example, may not have enough vitamin B-twelve. This is because, as people get older, their body loses its ability to take it from foods. Also, people who spend much time inside may need some extra vitamin D as the skin makes this vitamin from sunlight.

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