单项选择题

What kind of person needs this service

A．A doctor.
B．A policeman.
C．The sick.
D．A student.
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单项选择题
How much will it cost you if you want five regular papers and two graphs to be typed
A．$ 5
B．$ 1
C．$ 5.5
D．$ 6
单项选择题
We understand from the passage that the United States ______.
A．is rich in low-grade aluminum-bearing ores
B．is short of aluminum-making techniques
C．has to import ninety percent of its annual need of aluminum
D．has to produce fifty percent of the world's supply to meet its annual aluminum demand
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