175.　 cut down 砍倒，切断

　　　　　　　　 D

174.　 consider doing sth.考虑做某事

173.　 concentrate on sth. 全神贯注

172.　 come up with 提出

171.　 come up 过来

170.　 come to oneself 苏醒，恢复知觉

169.　 come to 变成

168.　 come over(to) 过来，顺便来访

167.　 come out 出来，出版

166.　 come on 赶快，来吧，动手吧