单项选择题

A．He doesn’t understand his staff.
B．His computer doesn’t work properly.
C．He doesn’ t know how to apply computer theory.
D．He is unable to add the figures.
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单项选择题
A．Camp in the mountains.B．Stay at his own house.C．Write to his girlfriend.D．Hold his uncle’ s mails.
A．Camp in the mountains.
B．Stay at his own house.
C．Write to his girlfriend.
D．Hold his uncle’ s mails.
单项选择题
The writer' s main purpose in writing the passage is to say that______.
A．science is just at its beginning
B．science has greatly improved man's life
C．science has made profound progress
D．science has done too little to human beings
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