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Unit6
When
was
it
invented
?
人教新目标版
九年级上
SectionA
1a-2c公开课
Warming
up
Do
you
know
Four
Great
Inventions
in
China?
四大发明
Papermaking
Gunpowder
Printing
Compass
invention
n.发明;
创意
In
what
order
were
they
invented?
When
was
it
invented?
invent
v.发明;
创造
Presentation
the
Warring
States
Period
th...