[单项选择]{{B}}{{I}} Questions 11 to 13 are based on the following passage. At the end of the passage ,you will be given 15 seconds to answer the questions.
Now listen to the passage.{{/I}}{{/B}}How long did it take Byrd and his colleagues to fly from Little America to the South Pole and back A. 19 hours. B. 17 hours. C. 18 hours. D. 16 hours.