单项选择题

A．occasion
B．substitute
C．change
D．compromise
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单项选择题
A．communicationB．commerceC．businessD．program
A．communication
B．commerce
C．business
D．program
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.
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