单项选择题

A．Professionals.
B．College students.
C．Beginners.
D．Intermediate earners.
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单项选择题
A．It uses an extensive vocabulary.B．It’’s useful as a teaching tool.C．Its author is unknown.D．Children find it repetitive and boring.
A．It uses an extensive vocabulary.
B．It’’s useful as a teaching tool.
C．Its author is unknown.
D．Children find it repetitive and boring.
单项选择题
A．Every day.B．Frequently.C．Occasionally.D．Very rarely.
A．Every day.
B．Frequently.
C．Occasionally.
D．Very rarely.
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