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.
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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．He had promised to do so.B．He had this kind of training before.C．He didn’t want to make the crowd disappointed.D．He needed the great amount of money.
A．He had promised to do so.
B．He had this kind of training before.
C．He didn’t want to make the crowd disappointed.
D．He needed the great amount of money.
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