Period 6Section B 3a-self-checkWhen were they invented
abacus in the 19th Centuryumbrella at the end of Spring and Autumn Period clean up thebinoculars in 1600camera in 1839bicycle in 1839car in 1885 motorcycle in 1885toothbrush in 1780 translate• It is only 5 dollars
• It is a special pen
• The pen was invented by Liu Jie
• The pen was invented last month
Put the sentences into the right places1
It is only 5 dollars
It is a special pen
The pen was invented by Liu Jie
The pen was invented last month 5
10 dollarsInvention Time Who Purpose Price 3a• Think of something that you do not like doing
Then think of an invention that could help you
Make notes
• Problem: quickly taking notes in class• New invention: a special pen• What it is used for:• Price:a pen that help to learn Ea pen t