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必修3《Warming up、Pre-reading、Reading、Comprehending》优质课PPT课件下载
The Solar System
HOW LIFE BEGAN ON THE EARTH
Lead-in
A puzzle：what is it?
It looks like a ball but you can’t play,
It is our home but so big,
It is round but we usually think it is flat
It moves anytime but no one feels.
The earth
A Quiz Game
1. How old is the earth?
A. About 3.5 billion years
B. About 4.5 billion years
C. About 5.5 billion years
D. About 6.5 billion years
2. ______ of the earth surface is covered
by water.
A. 20% B. 30% C. 50% D. 70%
3. How many planets are there in the Solar System?
A. 6 B. 7 C. 8 D. 9
4. How long does the rotation (自转) of the
earth take?
A. 12 hours B. 24 hours
C. a month D. 365 days
5. On what day is the Earth day celebrated?