A．Similar researches in other counies．
B．The impact of social networks.
C．The degree of modernization.
D．The qulily of people's friendships.

A．Anthropology.
B．Art．
C．Biology.
D．Psychology.

A．They have the same ancestor.
B．Van Truong is a fan of Van Gogh.
C．Van Truong used her notes to form a Van Gogh's painting
D．Van Truong hopes to be a painter as famous as Van Gogh