A:Go with the man.
B:Go to the hospital.
C:Ask the policeman for help.
默写。①最爱湖东行不足, (白居易《钱塘湖春行》)②无可奈何花落去, (晏殊《浣溪沙》)③ ,随风直到夜郎西。(李白《闻王昌龄左迁龙标遥有此寄》)④在《夜雨寄北》和《观书有感》中任选一首默写。
读图,完成下列问题.
函数y=cos22x﹣sin22x是( )
—South Africa.