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Recent medical studies confirm the e（） of a healthier lifestyle. (effectiveness, efficiency, power)
Recent medical studies confirm the e（） of a healthier lifestyle. (effectiveness, efficiency, power)
正确答案：efficacy
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DaoismAndEugeneONeillsPlays
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People with higher levels of education earn more, have more control over their f（）, and have healthier and better-educated children. (the ability to produce offspring, esp. abundantly)
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Climate reflects a basic struggle between c（） and change. (steadiness, stability, regularity)