—What is the weather like today?
—It's windy and cold.
下列各式:﹣x+1,π+3,9>2,x-yx+y,s=12ab,其中代数式的个数是( )
著名诗篇“三吏”、“三别”的作者被誉为“诗圣”,他是( )
—Miss Gao has ____________ free time than Mr Green.—I think so. She is busy every day.