单项选择题

The author draws on Los Angeles to prove that the ALA ______.

A．is right to assign an "F" to that area
B．often bases its report on the past events
C．has a good reason to stress smog risks
D．has overstated smog problems

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单项选择题

By citing figures from the EPA, the author seems to contend that ______.

A．the regulations about smog have proved effective
B．new regulations are necessary to deal with smog.
C．smog problems have actually become less serious
D．the federal smog standard has been rather tow

单项选择题

In Paragraph 3, the word spikes (in boldface) probably refers to ______.

A．the increase above the smog standard
B．the irregular readings about air quality in some areas
C．the occurrences of smog in Los Angeles
D．the current standards demanded by ALA