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．He advised him to learn science.B．He advised him to take interest in science.C．He advised him to apply for a scientific school.D．He advised him not to major in science.
A．He advised him to learn science.
B．He advised him to take interest in science.
C．He advised him to apply for a scientific school.
D．He advised him not to major in science.
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.
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