单项选择题

A．20 million.
B．200 million.
C．400 million.
D．40 million.
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单项选择题
A．General Motors.B．The United Auto Workers.C．NIHD．All of above.
A．General Motors.
B．The United Auto Workers.
C．NIH
D．All of above.
单项选择题
The questions presented in the first paragraph ___________.
A．seem to have no answers whatever
B．are intended to dig for ancient human minds
C．are not scientific enough to be answered here
D．are raised to explore the evolution of human appearance
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