单项选择题

The chemical was found to be detrimental to human health.

A．toxic
B．immune
C．sensitive
D．allergic
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单项选择题
You should stop ____ your condition and do something about it.
A．drawing on
B．touching on
C．leaning on
D．dwelling on
单项选择题
Officials are supposed to ____ themselves to the welfare and health of the general public.
A．adapt
B．confine
C．commit
D．assess
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