by
Gordon (Guoping) Feng, Mark Davies
Language: English
Release Date: April 21, 2017
Starting from 1990, Corpus of Contemporary American English (COCA) picks 20 million words of English text and speech each year, and now contains more than 500 million words. Based on COCA, this series of The Graded Lexicon of English offer 6 levels of English vocabulary:Elementary, Intermediate,...