单项选择题

A．The Arctic coast.
B．The west coast.
C．The east coast.
D．The central plain.
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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.
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.
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
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