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51. chronic a. 慢性的;严重的 52. circulation n. 循环; 发行(量)Reader has the largest ~ in China. 53. climax n. 高潮 the ~ of the play 54. cling to v. 紧紧抓住， 依恋;坚持，墨守The baby clung to his mother./ ~ to the hope that.... 55. coincidence n. 巧合 56. collaboration n. 合作 in ~ with 57. collide v. 相撞; 冲突 The two opinions ~ with each other. 58. commence v. 开始 59. commute v. 乘车上下班 I have to ~ between the university town and the downtown area. 60. compact a. 紧凑的, 结实的 a ~ car/office | 
