单项选择题

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.
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A．She has never been to Gettysburg.B．She took a political science course.C．Her family still goes on vacation together.D．She’’s interested in the United States Civil War.
A．She has never been to Gettysburg.
B．She took a political science course.
C．Her family still goes on vacation together.
D．She’’s interested in the United States Civil War.
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