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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单项选择题
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.
单项选择题
A．All of them died because of falling off high buildings.B．All of them had the experience of falling off high buildings.C．All of them were born in New York.D．All of them were born within five months.
A．All of them died because of falling off high buildings.
B．All of them had the experience of falling off high buildings.
C．All of them were born in New York.
D．All of them were born within five months.
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