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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单项选择题
Mobility is one of the characteristics often（）executives, and they must accustom themselves to moving quite regularly.

A. demanded of
B. asked for
C. expected from
D. called for
单项选择题
Everything in the universe undergoes（）development and change.

A. continuous
B. continual
C. continued
D. constant
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