单项选择题

We learn from the third paragraph that ______.

A．London was plagued with rats in the 1950s
B．London is covered with smog today
C．London was polluted by smog in the 1950s
D．Los Angeles is as heavily polluted today as London was in the 1950s
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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"
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
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