单项选择题

Heavy ______ to environmental tobacco smoke at work has been shown to double the risk of lung cancer.

A. touch
B. contact
C. exposure
D. encounter
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单项选择题
Pets are ______ providing not only companionship to humans, but health benefits to many as well.
A. accused of
B. ascribed to
C. prohibited from
D. credited with
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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