单项选择题

All of the following statements are true of climate scientists EXCEPT ______.

A．they are all clued up about climate.
B．they don't know much about climate.
C．they are probing into the field of climate.
D．they are uncertain of climatic phenomena.

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单项选择题

The expression bracing themselves for the worst in the second paragraph probably means ______.

A．sneering at the impending difficulties
B．cheering themselves up for the worst situation.
C．preparing themselves for the worst situation.
D．having a total disregard for the coming difficulties.

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.