单项选择题

The main difference between the Earth's atmosphere and the simulated one is ______.

A．their size.
B．their content.
C．their height.
D．their density.
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单项选择题
As to global warming in the next century, climate scientists' answer is ______.
A．ambivalent.
B．inexplicit.
C．negative.
D．affirmative.
单项选择题
The phrase cooped up in the second paragraph probably means ______.
A．mobilized.
B．captivated.
C．confined.
D．shoved.
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