单项选择题

The author of this passage is probably ______.

A．a reporter for a newspaper
B．a commentator on national policies
C．a member of the House
D．an expert on border issues
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单项选择题
What is said about the communicative functions of laughter
A．Meanings conveyed by laughter vary with languages.
B．Laughter serves as a way of interaction with animals.
C．Laughter helped interaction before humans could speak.
D．Human laughed at the very beginning as a sign of pleasure.
单项选择题
A laughter can arouse many others in the same group to laugh partly because ______.
A．laughter is a sign of open mind and freedom
B．people tend to laugh in a friendly atmosphere
C．people laugh back to show their good manners
D．laughter gives people a sense of belonging
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