16. caution, n. 谨慎；警告 v. 告诫17. cease, v. 停止；终止18. celebrate, v. 庆祝；赞美19. challenge, n. 挑战 v. 向…挑战20. channel, n. 渠道；频道 v. 引导21. chaos, n. 混乱；无秩序22. characterize, v. 描绘；具有…特征23. charge, v. 收费；充电 n. 费用24. charity, n. 慈善；施舍25. circulate, v. 循环；传播26. circumstance, n. 环境；情况27. cite, v. 引用；引证28. civil, adj. 公民的；民事的29. clarify, v. 澄清；阐明30. classify, v. 分类；归类
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