Among the theories to explain the origin of AIDS, the polio vaccine theory, in the opinion
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______
A. tough
B. easy
C. toughly
______
A. so that
B. so
C. in order to
The purpose of using UPC is to improve efficiency in stores.
A. Right
B. Wrong
C. Doesn't say
Which parts of the book did the reviewer most enjoy reading？
A. how the interviewees became Chief Executives
B. what sort of people the interviewees are
C. the advice given by the interviewees
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