单项选择题

The levels of PM2.5 in Beijing are by far the worst since the government began releasing figures on PM2.5 particles.

A. by a considerable margin
B. until the present moment
C. over a large area
D. according to most people
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Psychologists have stated that negative thinking can consume your life and cause problems.
A. optimism
B. patriotism
C. heroism
D. pessimism
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The analyst warns investors that an appealing idea does not necessarily make for a good fund.
A. abundant
B. apparent
C. attractive
D. acute
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