单项选择题

A．result
B．mark
C．impression
D．difference
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单项选择题
According to the speaker, when are hippos likely to yawn
A．When they are swimming.
B．When they are quarreling.
C．When they are socializing.
D．When they are eating.
单项选择题
A．butB．justC．andD．therefore
A．but
B．just
C．and
D．therefore
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