单项选择题

A．its vacuum tubes.
B．Its electronic circuits.
C．Computer programs.
D．All of the above.
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单项选择题
A．It’s a harmful to health.B．It’s a waste of money.C．It’s bad for woman.D．It’s not easy to quit.
A．It’s a harmful to health.
B．It’s a waste of money.
C．It’s bad for woman.
D．It’s not easy to quit.
单项选择题
A．Buses and trains are too crowded.B．A person can move around freely.C．It is easy to maintain cars.D．A driver is usually safe in his ear.
A．Buses and trains are too crowded.
B．A person can move around freely.
C．It is easy to maintain cars.
D．A driver is usually safe in his ear.
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