1John G Blair, Jerusha Hull McCormack. Western Civilization with Chinese Comparisons [ M].上海:复旦大学出版社,2006:48-49.
2Skehan, P. Second language acquisition research and task -based instruction. [ C ]. In Challenge and Change in Language Teaching, ed. Jame Willis & Dave Willis. Heinemann, 1996.
3Tribble, C. Writing [ M ]. Oxford : Oxford University Press, 1996.
4White,R. , & Arndt, V. Process Writing[ M]. Harlow: Longman, 1991.