Unit 6 When was it invented?
The Fifth Period Grammar Focus / Self Check / Writing
Teaching aims（教学目标）
一、熟练掌握以下词汇：fridge, translate, lock, ea rthquake, sudden, biscuit, cookie, instrument
二、通过学习，掌握以下句型：
1. –When was the zipper invented?
– It was invented in 1893.
2. – Who was it invented by?
– It was invented by Whitcomb Judson.
3. – When was tea brought to Korea?
– It was brought to Korea during the 6th and 7th centuries.
4. –What is the hot ice-cream scoop used for?
– It’s used for serving really cold ice-cream.
