Lesson 25
compass
Cai Lun
gun powder
Bi Sheng
printing
inventions
Which of these do you think is
(1) the most useful invention?
(2) the second most useful invention?
(3) the third most useful invention?
Which of these would you most like to own
拥有
Which of these do you think is
(1) the most useful invention?
(2) the second most useful invention?
(3) the third most useful invention?
practice
Inventions are very important for our daily life, but it is not very easy to invent something. Thomas Edison, a great scientist and inventor, told us that …
Edison
watch and answer
What did Edison say?
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