(共8张PPT)
导读 话题妙切入
UNIT 3 Back to the past
Almost 6，500 kilometres．
Silk，spices，cloth，valuable stones and gold．
个d品(共8张PPT)
导读 话题妙切入
UNIT 2 Out of this world
They could see the size，colour，and brightness of a star．
By the spectroscope．
个d品(共9张PPT)
导读 话题妙切入
UNIT 4 Protecting our heritage sites
In 1987．
The country is not taking good care of them．
个d品(共10张PPT)
导读 话题妙切入
UNIT 1 Wish you were here
Russia．
The west coast of Canada．
个d品
