单项选择题

A．Three times.
B．Four times.
C．Six times.
D．Seven times.
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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.
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.
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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