单项选择题

A．It should be higher.
B．It’’s very good.
C．It’’s the same as the post office pays.
D．It varies according to the person’’s experience.
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单项选择题
A．It moves the same way as fish do.B．It is propelled by tides and currents.C．It swims with its string in all directions.D．It copies the principle of jet propulsion.
A．It moves the same way as fish do.
B．It is propelled by tides and currents.
C．It swims with its string in all directions.
D．It copies the principle of jet propulsion.
单项选择题
When the author was invited by Mrs. Brown to go on a picnic, she accepted it happily.
A．Y
B．N
C．NG
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