单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Cleaning the house on Sunday.
B．The weather on Sunday.
C．Thunder arid lightning on Sunday.
D．Their plan on Sunday.
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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.
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.
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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