单项选择题


Questions 29 and 30 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions.
Now listen to the news.
The testing samples were collected after ______.

A.the athletes went to the police station for the test
B.the athletes just finished their competitions
C.the police caught the athletes in an illegal bar
D.the police raided the athletes’ accommodation