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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We've just installed a fan to ______ cooking smells from the kitchen.
A. eject
B. expel
C. exclude
D. exile
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How does the author feel about the conventional teacher’s training
A. Ridiculous.
B. Unjust.
C. Complicated.
D. Irrelevant.
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