单项选择题

A．General Motors.
B．The United Auto Workers.
C．NIH
D．All of above.
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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
单项选择题
To begin with, the author is trying to remind us of ____________.
A．the likelihood of climate change making life inconvenient
B．the warning against worsening climate change
C．the inevitable consequence of global warming
D．the misconception of a warmer world
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