单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. What were Dr. Ninn’s lectures like

A.She was brief and to the point.
B.She described things like a news reporter on the radio.
C.She made the events sensible.
D.She made history into a system.