单项选择题
A. He has to wear jeans. B. He has to wear a tie. C. He has to wear a coat. D. He has to wear shoes.
A. Not all the subjects have to do with philosophy. B. A person will get a PhD. if he/she studies philosophy. C. Philosophy can be helpful for the study of any other subjects. D. Philosophy is the only solution to all the problems in the world.
A. France B. The United States C. Spain D. Italy