先看例句: (1)“美帝及其走狗在越南、老挝打不赢……”(毛泽东1970年“5.20”声明) (2)“不要随地吐痰、乱扔纸屑。”(选自列车播音录音) (3)“昌平、怀柔、密云、平谷有小雨。”(选自北京人民广播电台《天气预报》) (4)“小马听了老牛的话,立刻跑到河边准备趟过去。突然从树上跳下一只松鼠,拦住他大叫:‘小马！别过河,别过河,河水会淹死你的！’”(选自《小马过河》) Look at example sentences: (1) “US imperialism and its lackeys can not win in Vietnam and Laos ...” (Mao Zedong’s “5.20” Statement in 1970) (2) “Do not spit on and litter confetti.” Train recording and recording) (3) “Changping, Huairou, Miyun, Pinggu have light rain.” (From Beijing People’s Broadcasting Station “weather forecast”) (4) “Pony heard the cow, then immediately went to the river to prepare for the trip In the past, he suddenly jumped off a squirrel from the tree and stopped him and shouted: ’Pony! Do not cross the river, do not cross the river, the river will drown you!’ ”(Selected from“ The Pony Across the River ”