Tests have proved that caffeine affects the body by increasing the heart rate and rhythm,
A. in turn
B. in return
C. turn back
D. as a result
正确答案是（）
A. dilution
B. watering
C. mixture
D. thickening
正确答案是（）
A. compensate
B. make up
C. replenish
D. refill
The man warns the woman NOT to
A. miss her card game.
B. stay up too late.
C. take too heavy a workload next semester.
D. neglect her studies to play bridge.
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