单项选择题

A．communication
B．commerce
C．business
D．program
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单项选择题
What is the speaker’s main point
A．Animals yawn for a number of reasons.
B．Yawning results only from fatigue of boredom.
C．Human yawns are the same as those of other animals.
D．Only social animals yawn.
单项选择题
For native speakers understanding English pop songs is
A．effortless.
B．impossible.
C．difficult.
D．unnecessary.
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