填空题

Because little research had been done on the explanation of happiness, before going into the lab, Lyubomirsky had done some ______.

【参考答案】

groundwork
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In the happiness pie chart, error factors account for 10 percent.
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Lyubomirsky designed a Subjective Happiness Scale because she believed it was each person’s ______ that can faithfully record their own happiness.
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