填空题

Before Lyubomirsky carried out her own research, scientists investigated happiness mainly through ______.

【参考答案】

correlational studies
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单项选择题
A．The woman invites the man to have dinner.B．The man won’t visit the woman.C．The man is very busy these days.D．The man’s wife is relatively free.
A．The woman invites the man to have dinner.
B．The man won’t visit the woman.
C．The man is very busy these days.
D．The man’s wife is relatively free.
填空题
A large sum of money must be spent on Lyubomirsky’s research because it needs to trace a lot of people ______.
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