单项选择题

A．Human beings make fewer errors.
B．Human beings do not have to be programmed.
C．Human beings work more quickly.
D．Human beings have to be programmed.
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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.
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.
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