单项选择题

If you have 20 pages to be typed, how long does it take to get them finished

A．More than 48 hours
B．More than 24 hours.
C．Within 24 hours.
D．In 24 minutes.
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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
By immersing ore particles in water, ______.
A．we can get ore particles of equal size
B．we can purify aluminum particles
C．we can filter out aluminum
D．we can improve the working conditions around
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