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.
Which of the following statements is NOT true

A．For six months of the year there is total darkness in Antarctic.
B．Even in the summer months the temperature is often below zero in Antarctic.
C．The expedition led by Ronald Amundsen was the largest and best equipped expedition that had ever set out for the Antarctic.
D．Byrd’s major achievement was to introduce the use of aircraft, radio and other devices in polar exploration.