单项选择题

A．It was made of aluminum.
B．It wasn’t large enough.
C．It wouldn’t move in the wind.
D．It was too heavy to put up.
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单项选择题
A．How most mathematicians work.B．Accidental discovery about the earth’s shape.C．How to track an orbit.D．How astronauts use computers to measure the size of satellite.
A．How most mathematicians work.
B．Accidental discovery about the earth’s shape.
C．How to track an orbit.
D．How astronauts use computers to measure the size of satellite.
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