单项选择题

A．To prove the earth was round.
B．To gather information for planning space flights.
C．Because all spacecraft had to carry computers.
D．Because it can measure the size of the satellite.
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单项选择题
A．Three times.B．Four times.C．Six times.D．Seven times.
A．Three times.
B．Four times.
C．Six times.
D．Seven times.
单项选择题
A．It is far away from the city she lives in.B．It is a place where many great people were born.C．It has a certain political influences in the United States right after the battle at Gettysburg.D．It is worth reading history about Gettysburg.
A．It is far away from the city she lives in.
B．It is a place where many great people were born.
C．It has a certain political influences in the United States right after the battle at Gettysburg.
D．It is worth reading history about Gettysburg.
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