单项选择题

How do dogs challenge

A．Baring their teeth.
B．Wagging their tails.
C．Standing firm with hair erect.
D．Rubbing their nos
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单项选择题
According to the passage, what is the goal of a Western-style conversation
A．An extended exchange of opinions.
B．A polite expression of support.
C．The defeat of one's partner.
D．A practical solution to a problem.
单项选择题
According to the passage, the maria differ from the terrace mainly in terms of ______.
A．age
B．manner of creation
C．size
D．composition
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