Unit 6 When was it invented
一、教学目标：
1. 语言知识目标：
1) 能掌握以下单词： heel, scoop, electricity, style, project, pleasure, zipper, daily, website, pioneer, list, mention
能掌握以下句型：
① —When was the telephone invented?
—I think it was invented in 1876.
② —What are they used for?
—They are used for seeing at night.
2) 能谈论物品被发明的时间、发明者，表达某发明的用途。
