单项选择题

They have done away with ______ Latin for university entrance at Harvard.

A. influential
B. indispensable
C. compulsory
D. essential
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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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