单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Unit5,Plus and minus,13,thirteen,15,fifteen,16,sixteen,18,eighteen,14,fourteen,1 7,seventeen,20,twenty,19,nineteen,Guess:,Who am I?(我是谁？),我由three个字母组成；,我的第一个字母是No.,two,；,第二个字母是No.fifteen；,第三个字母是No.,twenty-five,.,boy,+,plus,five,plus,two,5,+,2,2+7,6+9,4+11,1+17,two,plus,seven,six,plus,nine,four,plus,eleven,one,plus,seventeen,+,plus,Its,seven,Whats,?,five,plus,two,+,=8,1,2,+,=12,3,+,=10,Do the exercises:,20-4,twenty,minus,four,4,-,3,9,-,6,7,-,2,four,minus,three,nine,minus,six,seven,minus,two,What,nine,minus,four,?,Its,five,9,-,4=,?,Whats,eight,minus,two,?,Its,six,.,11-6=,9-4=,7-2=,12-8=,10-1=,14-7=,6-4=,13-5=,8,9,7,4,5,2,9-2=,7-4=,11-2=,15-5=,17-6=,20-8=,Homework:,1.听录音跟读Unit5课文3遍。,2.用加减法的算式编写一组对话和同桌交流。,