As Clemons (2008, p. one) pointed out that the above condition would occur when competition supply comparable goods which meet up with your purchaser pleasure and when the services and products you offer fall short to fulfill their wants and desires. 很多准备去美国留学的同学在了解美国的学校时可能会发现一个现象，就是美国的留学生写作论文时会在网上找代写。这时候他们就不禁产生疑问，是因为... http://report06159.alltdesign.com/the-definitive-guide-to-report-31849701