阅读理解。
     Which would you like a hot dog, a hamburger, or a piece of pizza? Young people of today select 
 pizza as their favorite food. Hot dogs were number one in the past, but now they are third in the list. 
 Hamburgers are second.          
     After World War II, pizza came to the United  States from Italy. Since then it has become more  and 
 more popular. Every American eats about  thirty-one slices of pizza each year.     
     Pizza has more food value than hamburgers and hot dogs. That is, pizza is one kind of healthier food 
 for your body. There are many kinds of  pizza, but a plain cheese pizza is still the most popular.
1. The second popular food among young people today is _____.
    A. hot dogs                  
    B. pizza
    C. hamburgers              
    D. cheese
2. Today, hot dogs are the_____.
    A. cheapest food
    B. most popular food
    C. most healthy food
    D. third most popular food
3. The best title (标题) for the passage is
    A. Pizza-The Favorite Food
    B. Pizza and World War II
    C. Pizza Keeps You Healthy
    D. Hot dogs and Hamburgers
4. How much pizza does one American eat each year?
    A. One piece of bread.
    B. Two slices of pizza.
    C. Thirty pieces of bread.
    D. Thirty-one slices of pizza.
5. Is the pizza healthy for our body?
    A. Yes, it is.
    B. No, it isn't.
    C. Sorry, I don't know.
    D. Yes, they are.