单项选择题

What do we usually think of our normal behavior

A．It is controlled by powerful thoughts.
B．It is beyond the study of psychology.
C．It doesn't need to be explained.
D．It doesn't seem to be natural sometimes.

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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

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