单项选择题

The word "specters" (first sentence, Paragraph two) is closest in meaning to ______.

A．"pollution"
B．"carbon dioxide"
C．"aerosols"
D．"ghosts"
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单项选择题
The only way to stop the spread of aerosols in the atmosphere, according to Dr. Rasool and Dr. Schneider, is to use ______.
A．fossil fuels
B．electric power
C．nuclear energy
D．coal power
单项选择题
The author's main purpose in writing the article is to warn of ______.
A．warm weather
B．hot weather
C．a new ice age
D．a new iceberg
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