单项选择题

A．Brother and sister.
B．Mother and son.
C．Teacher and student.
D．Classmates.
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单项选择题
A．Customs officers have to ensure safety of the parcel.B．It will be convenient for the parcel to be transported.C．It will be easier for the airline to load and unload the parcel.D．The contents of the parcel must be checked when collected.
A．Customs officers have to ensure safety of the parcel.
B．It will be convenient for the parcel to be transported.
C．It will be easier for the airline to load and unload the parcel.
D．The contents of the parcel must be checked when collected.
单项选择题
A．Air traffic conditions.B．Traffic jams on highways.C．Road conditions.D．New traffic rules.
A．Air traffic conditions.
B．Traffic jams on highways.
C．Road conditions.
D．New traffic rules.
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