单项选择题

A．effortless
B．impossible
C．difficult
D．unnecessary
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单项选择题
A．The History of Pop.B．The Road to Music.C．Pop Words.D．About the Big Hits.
A．The History of Pop.
B．The Road to Music.
C．Pop Words.
D．About the Big Hits.
单项选择题
A．Animals yawn for a number of reasons.B．Yawning results only from fatigue or boredom.C．Human yawns are the same as those of other animals.D．Only social animals yawn.
A．Animals yawn for a number of reasons.
B．Yawning results only from fatigue or boredom.
C．Human yawns are the same as those of other animals.
D．Only social animals yawn.
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