It is postulated that population trends have an effect on economic fluctuations.（）

单项选择题As the proverb says: He that shuts love out, as a result, shall be shut out from love.（）

A．in order
B．in return
C．in rotation
D．in turn

单项选择题A man or woman makes direct contact with society in two ways: as a member of some familial, professional or religious group, or as a member of a crowd.（）

A．intimate
B．very familiar
C．relating to the family
D．private