单项选择题

A．2:00 am.
B．1:00 am.
C．12:00 pm.
D．11:00 pm.
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单项选择题
A．about one million students.B．more than one million students.C．nearly one million students.D．over one billion students.
A．about one million students.
B．more than one million students.
C．nearly one million students.
D．over one billion students.
单项选择题
A．Intellectual challenge.B．Physical challenge.C．Social challenge.D．Economic challenge.
A．Intellectual challenge.
B．Physical challenge.
C．Social challenge.
D．Economic challenge.
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