Dr. Lyubomirsky mainly studies the causes of ______.
A: happiness
B: bad behavior
C: insomnia
A: happiness
B: bad behavior
C: insomnia
举一反三
- Dr. Lyubomirsky mainly studies the causes of ______.
- Before Lyubomirsky carried out her own research, scientists investigated happiness mainly through ______.
- In Lyubomirsky’s opinion, happiness is determined by ______.
- According to Lyubomirsky, our sense of happiness cannot be improved.( )
- What may NOT be included among the causes of insomnia?