A、A Greek sportsman. B、A judge from the host country. C、An official from the host country. D、A sportsman from the host country.

The Olympic Games are the greatest festival of sports in the world. Every four years, a hundred or more countries send their best sportsmen to compete for the highest honors in sports. As many as 6,000 people take part in over 20 sports. For the winners, there are gold medals and glory. But there is honor, too, for all who compete, win or lose. That is the spirit of the Olympics — to take part is what matters.
    The Olympic Games always start in bright colour and action. The teams of all the nations’ parade in the opening ceremony and march around the track. The custom is for the Greek team to march in first. For it was in Greece that the Olympics began. The team of the country where the Games are being held — the host country — marches in last.
    The runner with the Olympic torch then enters the stadium and lights the fire. A sportsman from the host country takes the Olympic oath on behalf of all the competitors. The judges and officials also take an oath. After the sportsmen march out of the stadium, the host country puts on a wonderful display.
    The competitions begin the next day. There are usually more than twenty sports in the Games. The rule is that there must be at least fifteen. The main events are in track and field, but it is a few days before these sports start. Each day the competitors take part in a different sport — riding, shooting, swimming, and cross-country running. Points are gained for each event. Medals are awarded for the individual winners and for national teams.
Questions 16 to 19 are based on the passage you have just heard.
16. Why is there honor for the losers as well as for the winners?
17. What is a long-established practice in the opening ceremony?
18. Who takes the Olympic oath?
19. What are the most important events in the Olympic Games?