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九年级英语上册 Unit 4 Amazing Science Topic 1 When was it invented Section D课件 仁爱版.ppt


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Unit 4 Amazing Science Topic 1 When was it invented ?
Section D
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What’s it used for?
It’s used for listening to music.
What’s it made of?
It’s made of plastic.
Where was it invented?
It was invented in Korea.
When was it invented?
It was invented in 1998.
2
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What’s it used for?
It’s used for communicating easily.
What’s it made of?
It’s made of plastic and metal.
Where was it invented?
It was invented in America.
When was it invented?
It was invented in 1973.
3
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What method did you use to find your lost cellphone?
GPS is like a man-made star. We can use it at any time, in any place and in any weather to find out our position. The early explorers used the stars as landmarks to know where they were and in which direction they were going. This method worked well at night as long as the weather was good. But it didn’t
work so well during the rest of the time.
Let’s use the GPS.

勘探者
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1. How did the early explorers know where they were?
They found out where they were by using stars.
2. What’s the disadvantage of using the stars as guiding marks?
Its disadvantage is that it didn’t work well when the weather was bad and the stars could not be seen.
3. What is a GPS? Is it useful to use?
It is like a man-made star. We can use it at any time, in any place and in any weather to find out our position. It is very useful.
4. What do you think the GPS will be used for in the future?

Read the passage and discuss the questions on Page88.
5
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Key words
explore
explorer, mark
find out, in…direction
work well, as long as
the rest of the time
solve, like, use, the shape of
great invention
,记号,符号
,做标记
Retell it !
6
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根据首字母提示,完成短文。
Thanks to GPS, we can exactly know w _____we are now. GPS is like a man-made “star”. It can be u____ in any place and any weather condition to find out our p________. In the past, the early explorers had to use stars in the s____ to tell them

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