四级写作常用的句式：表示目的

　　表示目的

　　1.The purpose of a test is to show what you have learned about a subject

　　2. Believe it or not, her only purpose in saying all that is to help you help yourself

　　3.Competitive sports are recommended to young adults to prepare them for the competitive world of colleges and business

　　4.The ultimate object of scientific inquiry is to discover the laws of nature.