单项选择题

The ______ of AIDS has led to an expansion in research seeking a cure.

A. innovation
B. selection
C. proliferation
D. conviction
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Silk, printing, paper, the compass and powder originated in China, and ______ introduction in the west had far reaching effects.
A. these
B. their
C. those
D. its
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I'd like to arrive 20 minutes early ______ I can have time for a cup of te
a.A. as soon asB. as a resultC. in caseD. so that
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