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
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