A、Because they cook everything in one whole piece. B、Because they don’t like to use chopsticks. C、Because they need to use knive

In China, people use chopsticks when they eat meals. Chinese people can use chopsticks to eat any kinds of food except soup. They use a spoon to eat soup. They cut the meat into small pieces before they cook it. They do not need to cut the meat up while they are eating, so they can eat their meals with chopsticks.
    In the U. S. , people use forks, spoons, and knives when they eat. In fact, American people usually eat beef, steak, or chicken. They cook that meat in one whole piece. They need to use knives and forks to cut them up.
    Americans use the fork with their left hand and use the knife with their right hand when they cut meat. After they cut it into small pieces, they change the fork from the left hand to the right hand. Then they eat the meat. When Chinese people use a fork and a knife, they feel that their hands are very busy and that this way of eating is too complicated.
Questions 11 to 12 are based on the passage you have just heard.
11. Why do Americans use knives and forks when they eat?
12. What is the main idea of the passage?