UNIT 17 Housework\n [au:]第十七单元 家务\n [00:04.30]Dialogue\n [au:]对话\n [00:06.01]1 Look and listen. Then read and act out the dialogue.\n [au:]1 看一看，听一听，读一读然后表演对话。\n [00:13.60](Billy, the alien, is wi...
