单项选择题

Scientists, like other people, are always pleased to have their own ideas ______.

A．validating
B．to be validated
C．validated
D．being validated
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单项选择题
Wherever two or more unusual traits or situations are found in the same place, it is tempting to look for more than a coincidental relationship between them.
A．vestiges
B．residues
C．characteristics
D．figures
单项选择题
Costs for regulation of business actually are a hidden tax severely reducing the competitive ness of domestic businesses ______ when they face an increasingly global marketplace.
A．on occasions
B．at a time
C．under the circumstances
D．at once
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