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.
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单项选择题
A．He took a tour of the city.B．He read about it.C．He wrote an article about it.D．He worked there as a guide.
A．He took a tour of the city.
B．He read about it.
C．He wrote an article about it.
D．He worked there as a guide.
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