Key sentences in SC 1. 发明有多种产生方式。 2. 大多数时候，发明的产生源于有人努力地想解决一个难题。

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1 Key sentences in SC 1. 发明有多种产生方式。 2. 大多数时候，发明的产生源于有人努力地想解决一个难题。
3. 有的时候，发明源于偶然。 4. 但是，他们并没有因此而失去信心。 5. 在发明的过程中，仔细的计划是很重要的。

2 Key sentences in SC 发明有多种产生方式。 Inventions come about in many ways.
2. 大多数时候，发明的产生源于有人努力地想解决一个难题。 Most of the time, inventions happen because someone works to solve a problem. 3. 有的时候，发明源于偶然。 Sometimes inventions are the result of accidents. 4. 但是，他们并没有因此而失去信心。 But they weren’t discouraged by what people said. 5. 在发明的过程中，仔细的计划是很重要的。 Careful planning is important in the invention process. …的结果

3 Unit 4 Amazing Science Topic 1 When was it invented ?
Section D

4 Read the passage and discuss the questions on Page88.
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. …

5 Key sentences in SD 1. 通过星辰，他们可以判断自己身处何方，以及他们去往的方向。
2. 只要天气好，在能看见星星的晚上，这种方法就很有用。 3. 我们可以在任何时间、任何地点、任何天气使用它找到我们所在的位置。 4. 它还可以别用来研究我们地球的形状。 5. 但在其余的时间这种方法就不适用了。

6 Key sentences in SD 1. 通过星辰，他们可以判断自己身处何方，以及他们去往的方向。
Using the stars, they could find out where they were and in which direction they were going. 2. 只要天气好，在能看见星星的晚上，这种方法就很有用。 This method worked well at night as long as the weather was good and the stars could be seen. 3. 我们可以在任何时间、任何地点、任何天气使用它找到我们所在的位置。 We can use it at any time, in any place and in any weather to find out our position. 4. 它还可以别用来研究我们地球的形状。 It can also be used to study the shape of the earth. 5. 但在其余的时间这种方法就不适用了。 But it didn’t work so well during the rest of the time.

7 Exercises here sed osition ky xplore 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 where they were, however, this method didn’t work well when the weather was bad. So GPS is a great invention that can help humans to better e________ our planets. here sed osition ky xplore

8 Grammar Passive Voice (Ⅱ) The radio was invented by Guglielmo Marconi
When was the digital camera developed ? Where was it developed? What is a rocket used for? It was developed in the 1970s. It was developed in Japan. It is used for sending satellites or spaceships into space.

9 Functions I wish I could go into space some day.
I hope your dream will come true. It’s said that he invented more than two thousand things during his life. Inventing is interesting and exciting and everyone can be an inventor.

10 Grammar exercise C C B C A Passive voice was /were +done
( ) 1. A big supermarket _____in our city last year. A. is built B. were built C. was built ( ) 2.Could you tell me who the radio ____ by? A. invents B. invented C. was invented ( ) 3. Many trees and flowers _____ in our school last year. They made our school more beautiful. A. have planted B. were planted C. planted ( ) 4.The children ____ swim last month and they can swim very well now. A. are taught B. were taught C. were taught to ( ) 5.It is said that potato chips _____by mistake about one hundred years ago. A. were invented B. invented C. are invented C C B C A

11 were made wasn’t invited Were checked were planted
1.You are late, all the tickets __________(sell) out an hour ago. 2.This type of cellphone ____________(make )in Shenzhen. 3. I _________________ ( not invite) to yesterday’s party. 4. ________ those machines __________(check) this morning? 5. Many trees and flowers ______________(plant) in our school last year, and they made our school a beautiful garden. were sold were made wasn’t invited Were checked were planted were/was　+　v.的过去分词

12 Assignment Read 1a. Memorize the useful expressions and key sentences that we learn in this topic. Finish Section D in your workbook. Preview Section A of Topic 2.

13 Thank you