单项选择题

A．Four.
B．Five.
C．Six.
D．Seven.
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单项选择题
A．In the yellow pages.B．In the red pages.C．In the white pages.D．In the blue pages.
A．In the yellow pages.
B．In the red pages.
C．In the white pages.
D．In the blue pages.
单项选择题
A．Its private airline service.B．Being an American Post Office.C．Its transporting small packages.D．The low cost of its service.
A．Its private airline service.
B．Being an American Post Office.
C．Its transporting small packages.
D．The low cost of its service.
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