1Adel,A.& U.Romer.2012.Research on advanced student writing across disciplines and levels:Introducing the Michigan Corpus of Upper-level Student Papers [ J ].International Jour-nal of Corpus Linguistics,(1):1-32.
2Biber,D.,G.Leech & S.Conrad.2002.Longman Grammar of Spoken and Written English [ M ].Harlow:Pearson.
3Ellis,N.,R.Simpson-Vlach & C.Maynard.2008.Formulaic language in native and second-language speakers:Psycholin-guistics,corpus linguistics and TESOL [J].TESOL Quarterly,42:375-396.
5Hyland,K.2008.Academic clusters:Text patterning in pub-lished and postgraduate writing [ J ].International Journal of Applied Linguistics,(1):41-62.
6MacWhinney,B.2006.Emergent fossilization [ A ].In Z.Han & T.Odlin(eds.).Studies of Fossilization in Second Language Acquisition [ C ].Clevedon:Multilingual Matters.
7Neff,J.,F.Ballesteros,E.Dafouz,F.Martinez,J.Rica,M.Diez & R.Prieto.2004.Formulating writer stance:A contras-tire study of EFL learner corpora[ A].In U.Connor & T.Up-ton(eds.).Applied Corpus linguistics:A multidimensional Per-spective [ C].New York:Rodopi.
8Schmidt,R.1983.Interaction,acculturation,and the acquisi-tion of communicative competence:A case study of an adult [ A ].In N.Wolfson & E.Judd(eds.).Soeiolingttistics and Language Acquisition [ C ].Rowley:Newbuty House.