单项选择题

PM2.5 particles are thought particularly damaging to health because they can ______ deep into the lungs.

A. dive
B. penetrate
C. elevate
D. dig
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单项选择题
Concerned about the future of the country, the new president had a clear ______ of where to lead it.
A. fantasy
B. vision
C. image
D. recollection
单项选择题
It seems that countries with the highest regular chocolate intake per person have a ______ greater number of Nobel Prize winners.
A. proportionally
B. psychologically
C. previously
D. purposefully
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