Questions 11 to 18 are based on the conversation you have just heard.

A．Microwaves are strange electric waves.
B．Microwaves travel in straight lines and do not follow the curve of the earth’s surface.
C．There are not any wires to send microwaves.
D．We must amplify microwaves in relay stations.

A．She’s spending time going over her accounts.
B．She’s been home for only a few days.
C．She’s exciting about going home.
D．She’s counting the number of vacation days.