单项选择题

  The first thing we did was look for errors in our experimental design and for every conceivable ______ that could have led us astray.

A.exposition
B.scenario
C.illustration
D.scheme
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单项选择题
For the most part, black sportsmen accept that they have advantages, in an unspecified way, over their white ______.
A.supervisors
B.subordinates
C.counterparts
D.correspondents
单项选择题
It is finally realized how foolish it is to develop our economy ______ the environment.
A.for the sake of
B.on behalf of
C.at the cost of
D.in terms of
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