单项选择题


How long do children usually stay at university in the man’s country

A． Three or five years.
B． Three or four years.
C． Three to four years.
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What’s the relationship between the speakers
A． Husband and wife.
B． Ticket assistant and customer.
C． Friends.
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Why does the author mention dinosaurs at the end of the passage
A．Because they Could only live in the warm climate.
B．Because they once dominated the earth.
C．Because their extinction indicates future disasters.
D．Because dinosaurs and humans never live in the same age.
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