【单选题】

{{I}}Questions 17—20 are based on the following passage about the Olympic Games. You now have 20 seconds to read Questions 17—20.{{/I}} What is the most obvious feature of the parade in the opening ceremony

A、The runner enters the stadium with the torch.
B．Teams of different countries put on a wonderful display.
C．The host country marches in last.
D．There must be both men and women in all teams.