Chapter 4 Chapter 4 Numbers NumbersRevisionRivision of the wordsabacusbraincalculatorlightning1. _: almost 2. _: correct and true 3. _: strong 4. _: of or like people, not animals 5. _: on the other side in a game, fight, etc. 6. _: a group of things that work together 7. _: grow bigger or stronger;become better 8. _: give orders to a computernearly accurate powerfulhuman againstSay and spell the words according to the meaningssystem develop program9. _: use numbers to find answers A _ is a _ machine. It helps people to _ faster and more accurately because it can do a difficult _ in a flash.calculatorcalculatingcalculate calculationcalculatecalculate(v.)计算 calculation(n.)计算 calculator(n.)计算器 calculating(adj.)计算的10. _: make for the first time Benjamin Franklin was a famous _ .He _ the lightning rod（避雷针).It is a great _.inventorinventedinventioninvent (v.)发明inventor (n.)发明家invention (n.)发明invent11. _: that are going to be mentioned next Can you answer the _ questions? _ me please. Ill show you the way.followingFollowfollowingfollowing (adj.)下列的follow (v.)跟随12. _: not deadCan all _ things _ for several days without food?13. _ : very surprisingWe felt _ when we read the _ story.livingliveamazed amazingliving (adj.)活着的 live (v.)生活livingamazing amazing (adj.)令人惊奇的 amazed (adj.)感到惊奇的Revision of the phrasesSay the phrases according to the meanings 1. _:long,long ago 2. _: not less than 3. _: in a very short time 4. _:not in the same way 5._:in all ones life 6. _: work out the problemin ancient times at leastin a flash in different ways in ones whole lifetime solve the problem1. We can use water _, such as washing clothes or cooking food.2. Li Bai was a great poet who lived _.3. It took us one hour to _at least in a flash in ancient times in different ways solve the problemin ones whole lifetimein different waysin ancient times solve the problemat least in a flash in ancient times in different ways solve the problemin ones whole lifetime4. Your teacher looks old. He must be _ 50 years old. 5. My father lived in China _. 6. The computer finished the calculation _.at least in his whole lifetimein a flashKeep the same meaning of each sentence1. I spent two days doing this job.It _ me two days _ do this job.2. He is strong. He can carry the heavy suitcase.He is _ strong _ he can carry the heavy suitcase.He is strong _ _ carry the heavy suitcase.tooktosothatenoughtoRevision of the sentence structures3. The coat is expensive. He cant buy it.The coat is _ expensive _ he cant buy it.The coat is _ expensive for him _ buy. The coat is not _ _ for him to buy.sothatcheapenoughtootoRevision of the PassageAnswer the questions about the text What did people write in many different ways?2. In what way did people count?3. Who invented the zero?4. Why was the zero a very important invention?People wrote numbers in many different ways.People counted in tens.The Indians invented the zero.Because it made it easier to write big numbers and to calculate.5. Which was one of the first calculating machines?6. Why do people still use abacuses today?7. What can a modern electronic calculator do?8. Why do we say computers are very powerful?One of the first calculating machines was an abacus.Because they are fast and accurate.It can add, subtract, multiply and divide. It can also calculate percentages and square roots.Because it can do a calculation that you couldnot do in your whole lifetime in a flash.9. How long did Shakuntalas brain take to find the answer?Shakuntalas brain took fifty seconds to find the answer.Fill in the blanks according to the passageEveryone knows the international _ of numbers. In ancient times, numbers were written in _ ways, but counting was nearly always in _. Everyone uses the number _ 1 to 9 plus zero. The system was invented by the Indians. _ makes it easier to write big numbers and to _. languagetens systemZero calculatedifferentThere are three calculating machines, the abacus, the modern _ calculator and the computer. Which is more powerful, the computer or the human _? There was a competition between an amazing lady who is from _ and a powerful computer. However, the lady won. Her brain _ less time to find the answer, like _. Computers cant do anything by themselves. Someone had to first _ the computer.electronicbrainIndiatook lightningprogramWhat is each part mainly about?P1: different ways