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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deforestation
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.
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