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pass on 传递
In ancient times, there were no books and people
___ ___their knowledge by telling stories. They
wrote each word_______.
Words and phrases
passed on
by hand
The ___________appeared,
With ______ technology,
it was possible to print books quickly.
modern adj.现代的
printing press 印刷机
Words and phrases
printing press
modern
pass on 传递
by hand 用手；手工
But recently a new kind of books _________:the
________book(e-book).
It is easier for people to
buy and _____ online.
Words and phrases
appeared
electronic
sell
appear v.出现
electronic adj.电子的
sell v.出售
printing press 印刷机
pass on 传递