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．It is the nerve cells of a computer.B．It is the brain of a computer.C．It is the eye of a computer.D．It is the heart of a computer.
A．It is the nerve cells of a computer.
B．It is the brain of a computer.
C．It is the eye of a computer.
D．It is the heart of a computer.
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