What was invented about one thousand years ago?

问题描述：

What was invented about one thousand years ago?
Who was it invented by?
What is it used for?
How was it developed?
Please answer in English!
Sorry!
倒数第二句应是
How has it developed?
1个回答 分类：英语 2014-12-10

问题解答：

我来补答
Paper was invented about one thousand years ago.
It was invented by Cai Lun.
It is used for writing on.
It was developed by foreigners.
 
 
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