单项选择题

A．Six months.
B．Ten months.
C．Two years.
D．Five years.
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单项选择题
A．Mice.B．Rats.C．Monkeys.D．A, B and C.
A．Mice.
B．Rats.
C．Monkeys.
D．A, B and C.
单项选择题
China’’s long-term program for socioeconomic development through the 21st century may include the content about prevention and control of AIDS.
A．Y
B．N
C．NG
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