单项选择题

Long ______ to harmful pollutants is most likely to lead to a decline in health.

A．contact
B．touch
C．use
D．exposure
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单项选择题
An intimate and ______ knowledge of how you are doing in the customer's eyes is critical.
A．objective
B．subordinate
C．optional
D．subsequent
单项选择题
The following account by the author ______ the difference between European and American reactions.
A．illustrates
B．acquires
C．demands
D．deletes
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