单项选择题

Tests have proved that caffeine affects the body by increasing the heart rate and rhythm, which ______affects the circulatory system.

A. in turn
B. in return
C. turn back
D. as a result
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Mary would just ______ go ______ stay.
A. rather, as to
B. as soon, as
C. prefer, to
D. sooner, as
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Ever since the rise of industrialism, education has been ______ towards producing workers.
A. harnessed
B. hatched
C. motivated
D. geared
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