阅读理解。 In China, many young people like playing soccer. It's very popular. But the Chinese don't call it soccer. They call it football. Are they different? In fact, there are two kinds of football games. One is American football, and the other is soccer. There are 11 players in a soccer team. And the soccer is round. Only the goal-keeper can play the ball with hands. The others can't play the ball with hands, and they can only play it with their feet. In the U.S.A., soccer is not very popular. They prefer playing American football to soccer. There are also 11 players in an American football team. The ball is not round. It's oval. All the players can play the ball with hands and feet. And the goal is bigger than the one of soccer games. American football is quite different from soccer. 根据短文内容，回答下列问题。 1.Which sport is very popular with many young people in China? _______________________________________________ 2.How many players are there in an American football team? _____________________________________________ 3.What's the shape of American football? _____________________________________________ 4.How many players in a team can play football with hands in a soccer game? _____________________________________________ 5.In the U.S.A., soccer is also very popular, isn't it? _____________________________________________