单项选择题

A．The distance-learning course is free of charge.
B．The distance-learning course is taught by professors overseas.
C．There is no regular class in the distance-learning course.
D．There is no exam in the distance-learning course.
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单项选择题
Only 10% of your investment is needed to get 90% of your increase in efficiency.
A．Y
B．N
C．NG
单项选择题
A．All the passengers were killed.B．The plane crashed in the night.C．No more survivors have been found.D．It’’s too late to search for survivors.
A．All the passengers were killed.
B．The plane crashed in the night.
C．No more survivors have been found.
D．It’’s too late to search for survivors.
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