1Bachman,L.F.&Palmer,A.S.Language Testing in Practice[M].Shanghai:Shanghai Foreign Language Education Press,1999.
2Brown,G.,&Yule,G.Teaching the Spoken Language:An Approach Based on the Analysis of Conversational English[M].Cambridge:Cambridge University Press,1983:321.
4BETTS E A. Readability: Its Application to the Elementary School [J]. Journal of Educational Research, 1949, (42): 438-459.
5DECHANT E V, SMITH H P. Psychology in Teaching Reading [M]. New Jersey: Prentice-Hall, Inc., 1961/1977.
6FLESCH R F. A New Readability Yardstick [J]. Journal of Applied Psychology, 1948, (32): 221-233.
7FRY E. Fry's Readability Graph: Clarifications, Validity, and Extension to Level 17 [J]. Journal of Reading, 1977, (38): 243-250.
8GILLILAND J. Readability [M]. London: University of London Press, 1976.
9BRUCE B, RUBIN A. Readability Formulas: Matching Tool and Task [A].ALICE DAVISON, GEORGIA M GREEN HILLSDALE (ed.).Linguistic Complexity and Text Comprehension: Readability Issues Reconsidered [C]. New Jersy: Lawrence Erlbaum Associates, 1988. 5-22.
10GRAY W B. How to Measure Readability [M]. Philadelphia: Dorrance & Company, 1975.
