单项选择题

A．Practical work.
B．Collective activities.
C．Teacher’’s encouragement.
D．Book knowledge.
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单项选择题
A．For a week.B．For two weeks.C．For three weeks.D．For a month.
A．For a week.
B．For two weeks.
C．For three weeks.
D．For a month.
单项选择题
A．They are necessary for modern man.B．They are unnecessary for survival.C．They are as good as computers.D．They are dangerous for us.
A．They are necessary for modern man.
B．They are unnecessary for survival.
C．They are as good as computers.
D．They are dangerous for us.
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