单项选择题
According to the author, social psychology should help man to（）
A．preserve individual rights. B．become healthier. C．be aware of history. D．improve material welfare.
单项选择题 Social psychology developed in the USA（）
单项选择题 People will only think better of travel medicine if（）
单项选择题 In Behren's opinion the question of who should run travel medicine（）
