单项选择题


A．Teacher and student.
B．Customer and saleswoman.
C．Patient and doctor.
D．Husband and wife.
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take off
单项选择题
Which of the followings is NOT TRUE
A．A dolphin can stay under the water for about six minutes.
B．A dolphin often comes to the top of the water to take in air.
C．Dolphins are not fish but mammals in the sea.
D．A dolphin doesn’t have a good hearing.
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