Lesson20 Say It in Five 课堂互动探究 词汇点睛 1 single adj.单- -的;单独的 |[观察] This kind of poem always talks about a single topic. 这种诗总是谈论-个单一的主题。 C Lesson20 Say It in Five |拓展] single还可译为“单程的”，与return 相对。a single ticket意为“单程票”; a return/round ticket意 为 往返票”。