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单项选择题

A．Because they are absent-minded in school.
B．Because they are tired of learning it.
C．Because they can not understand the rules.
D．Because they have so little time for it.
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单项选择题A．its vacuum tubes.B．Its electronic circuits.C．Computer programs.D．All of the above.

A．its vacuum tubes.
B．Its electronic circuits.
C．Computer programs.
D．All of the above.

单项选择题A．In the army.B．In his hometown.C．At home.D．In California.

A．In the army.
B．In his hometown.
C．At home.
D．In California.