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 the long run
B．in turn
C．in return
D．as a result
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单项选择题
The students were much encouraged______, a chance to talk with the Americans in English.
A．to get
B．given
C．to have got
D．having got
单项选择题
A．risksB．costsC．makesD．endangers
A．risks
B．costs
C．makes
D．endangers
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