30．The main purpose of this article is ________.

　　A．to tell you what to do if your bicycle is stolen

　　B．to suggest ways of keeping your bicycle safe

　　C．to give you advice on where to buy a good lock

　　D．to say why you shouldn't keep your bicycle in a quiet place

　　B

　　The literal meaning of philosophy is “love of wisdom”．But this meaning does not tell us very much.Unlike the other disciplines,_philosophy cannot be defined by what you study, because it is actually unlimited.Anything can be the subject matter of philosophy: history, law, language, literature, mathematics, and in fact, the other academic disciplines are directly related to philosophy.For this reason you get a Doctorate (博士学位) of Philosophy (Ph.D.) in biochemistry, or computer science, or psychology.

　　Two broad sub­fields of philosophy are logic and the history of philosophy.Logic is the science of argument and critical thinking.It provides sound methods for distinguishing good from bad reasoning.The history of philosophy involves the study of major philosophers and periods in the development of philosophy.

　　Of what use is philosophy? First it is useful in educational advancement.It is necessary for understanding other disciplines.Only philosophy questions the nature of the concepts used in a discipline, and its relation to other disciplines.And through the study of philosophy, one develops sound methods of research and analysis that can be applied to any field.

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