第六单元自测课件是什么时候发明的(人民教育新目标版)

Unit 6
When was it invented?
Self  Check
一般过去时被动语态
一般过去时的被动语态表示过去某一时刻发生的被动性动作, 其基本结构为：
    主语+ was / were + 过去分词+ by …
    The teacher was visited by them two years ago.
       他们两年前看过这位老师。
Fill in the blanks with the correct form of the given verbs.
The first paper __________ (make) in China in 105 AD.
For over 500 years the art of making paper __________ (limit) to China.
In 610, papermaking ______________ (introduce) into Japan.
Kites ___________ (know) in China about 3,000 years ago.