单项选择题

A．Because it serves only a few specialties.
B．Because it’s too crowded.
C．Because it’s too costly.
D．Because the service is too slow.
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单项选择题
A．About 45 million.B．About 5.4 million.C．About 50 million.D．About 4.5 million.
A．About 45 million.
B．About 5.4 million.
C．About 50 million.
D．About 4.5 million.
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