单项选择题

A．Only eight of the fourteen thousand kinds of flowers are black:
B．Only eight of the four thousand kinds of flowers are black.
C．The chance that we see black flowers is one-S000th.
D．The chance that we see black flowers is one 4000t
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单项选择题
A．African slaves.B．The Dutch.C．The Indians.D．The Britis
A．African slaves.
B．The Dutch.
C．The Indians.
D．The Britis
单项选择题
A．About 3500B．C．B. Long before history was written.C. When there was history record.D．About 4500B.
A．About 3500
B．
C．B. Long before history was written.C. When there was history record.
D．About 4500B.
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