听第二篇短文，回答16-20小题．
16．Why do people all over the world enjoy sports？
A．Because sports are very interesting．
B．Because sports can make people healthy and happy．
C．Because sports are thousands of years old．
17．What do sports change with？
A．The season．
B．The weather．
C．The time．
18．Which of the following sports is the oldest？
A．Running．
B．Basketball．
C．Volleyball
19．What do people in all countries near the sea prefer？
A．Football．
B．Jumping．
C．Swimming．
20．Why do people from different countries often become good friends after a game？
A．Because the game is exciting．
B．Because sports help them understand each other．
C．Because they begin to know each other．