阅读短文，根据短文内容选择正确答案。 Food is important (重要) for everyone,but not everyone has time to think about which food is good. Many Americans think that fast food is very convenient (方便的). They like to have lunch at places like McDonald's. They eat fast food about twice a week. They want to buy the most delicious fast food, not the healthiest (最健康) food. Now each American eats about three hamburgers and four bags of potato chips     every week. That is why more and more people are becoming fat. Most Americans know that fast food isn't good for them, but it seems that they can't stop eating it. In fact,more and more people are eating fast food. 96% of American primary school students know about McDonald's. In America, 33% of the children are too heavy. This makes it hard (困难) for them to move around and go up and down stairs (楼梯). They will have health problems (健康问题) later in life. Of course it's not only young people who are getting heavier. It's all Americans. 1. What is 'potato chip?' A. a kind of healthy food. B. A kind of snack. C. A kind of sea food. 2. How many children are too heavy in America? A. 67%of them. B. 96%of them. C. 33%of them. 3. Why are many Americans too heavy? A. Because they eat much food. B. Because they eat too much fast food. C. Because they eat too much healthy food. 4. Which is TRUE according to the passage (根据短文)? A. Americans don't like eating lunch at McDonald's. B. It's not good for us to eat too much fast food. C. 4% of American primary school students know about McDonald's. 5. What is the best title (题目) for the passage? A. Fast Food B. American Health Problems C. American Children like Fast Food