单项选择题

A．A vacation trip to Yellow Stone Park.
B．A lecture by a visiting professor.
C．Her biology thesis.
D．A research project.
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单项选择题
A．Kindly.B．Like dogs.C．Badly.D．Like criminals.
A．Kindly.
B．Like dogs.
C．Badly.
D．Like criminals.
单项选择题
A．Because engine trouble started.B．Because the runway couldn’t be seen clearly.C．Because the airport was not ready for the plane to land.D．Because some traffic accident happened at the airport.
A．Because engine trouble started.
B．Because the runway couldn’t be seen clearly.
C．Because the airport was not ready for the plane to land.
D．Because some traffic accident happened at the airport.
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