单项选择题

It can be inferred from the first paragraph that ______.

A．climate scientists are contemptuous of weather forecast.
B．it is a venture to forecast what weather is like tomorrow.
C．Schar has the audacity to do what others seldom did.
D．Schar has made gloomy predictions on future weather.

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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.

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.