4Bell,A. The Language of News Media [M]. Oxford: Basil Blackwell,1991.
5Enkvist,N.E. & J. Spenser. Linguistics and Style [M]. London :OUP,1964.
6Halliday M.A.K. An Introduction to Functional Grannar [M].London:Edward Arnold, 1994.
7Halliday M .A .K .& R .Hasan. Language , Context and Text :Aspects of Language in a Social-semiotic Perspective [M] . Oxford: Oxford University Press, 1990.
