SECTION A CONVERSATIONS In this section you
will hear several conversations. Listen to the conversations carefully and then
answer the questions that follow. Questions 1 to
3 are based on the following conversation. At the end of the conversation, you
will be given 15 seconds to answer the questions. Now listen to
the conversation. What does Mary think is so incredible and wonderful
A．The speed of light. B．The speed of telecommunication. C．Astronauts landing on the moon. D．The United States.