题目内容：
第27—30题要求从所给的6个选项中为每个句子确定一个最佳选项。Researchers have found that patients' stress levels decrease when they __________ A．recover from disease quickly
B．there is not enough hard evidence
C．use their minds actively
D．it improves general well—being
E．1isten to musical performances
F．it brings many other benefits
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