Stress can be extremely damaging to your health. Exercise, _, can reduce its effects.A. at

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A. at the same time
B. while
C. though
(答案→)D. meanwhile
解析：BC属于连词，不能放在句中表转折。A是一个介词短语，也不要放在句中表转折。Meanwhile同时。可以放在句中表转折。句意：压力可能会对你的健康有很大的破坏。同时锻炼可以减少这样的影响。