单项选择题

We are convinced that we are on the（）of an important discovery.

A. threshold
B. household
C. thread
D. entrance

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单项选择题
City officials am considering building a path to give the public（）to the site.

A. recreation
B. excess
C. excursion
D. access
单项选择题
The advertising industry has resorted to self-regulation in a serious effort to curtail not only bad taste but also misrepresentation and deception in copy and illustrations（）

A. avert
B. deny
C. exclude
D. reduce
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