高中英语外研版 (2019)必修 第三册Unit 3 The world of science优秀课件ppt

这是一份高中英语外研版 (2019)必修 第三册Unit 3 The world of science优秀课件ppt，共14页。PPT课件主要包含了Has，was built，have taken，Main body，Conclusion等内容，欢迎下载使用。

Learning aims:Review the grammatical rules abut the Present Perfect Passive and can use it crrectly in different cntexts.Read an experiment reprt and understand the structure f an experiment reprt.Learn hw t write an experiment reprt.
Step 1【回顾】关于现在完成时态，你能想起些什么？1.什么时候用现在完成时态？标志性时间状语有哪些？已完成：发生在过去的动作，已完成，强调对现在产生的结果或者影响;常与befre，already, never，ever，yet等连用；未完成：某个动作从过去一直持续到现在，还有可能继续延续下去；常与recently, lately，ever since，since then, s far，until/till nw,up t nw, in/during/ ver the ，these days, fr+时间段等连用2.特殊句式有哪些？It is/has been＋一段时间＋since从句 This/That/It is the first/secnd/... time that＋现在完成时
Part 1 Present Perfect Passive
当主语是动作的承受者时，用被动语态：have/ has been dne
Step2 They _____________(tell) many times nt t make nises. 他们被多次告知不要喧哗。_____ his bike ____________________ ? 他的自行车修好了吗? The bks ___________________________by the students.那些书还没有被学生们借走。 注意：现在完成时态的一般疑问句和否定形式。The bridge ___________(build) last year.  Great changes ____________(take) place in my hmetwn. S far, many villages _______________(visit).The party ___ _____ _______(plan) since the New Year. With the help f high technlgy, mre and mre new substances ________________(find) in the past few years.注意：一般过去时态仅表示发生在过去的动作，而现在完成时态强调过去动作对现在的影响。
have been tld
been repaired
have nt been brrwed
have been visited
has been planned
have been fund
Step 3 ExerciseActivity 2: Rewrite the underlined parts using the present perfect passive.
1. Many things in ur lives have already been affected.2. Fr instance, 3D-printed hamburgers have been served t custmers in sme restaurants in perhaps the mst significant success that has been achieved t date is in bdy parts, including a beating heart, have been made with 3D printing In Brazil, a new 3D-printed shell has been given t a turtle injured in a frest fire!
就连…也包括在内；甚至包括
Step 1Activity 5 Read the instructins fr the experiment and answer the questins. 1.What d yu think the results f this experiment will be? /skwiːz/v. 挤；压榨 The egg will squeeze int the can yu learn frm this experiment? The experiment shws us the effects f air pressure. Air pressure indeed exists, and it is very pwerful.
Part 2 Writing an experiment reprt
Egg in a Bttle ExperimentWhy des the egg get pushed inside the bttle?The answer is all abut air pressure. If yu first set the egg n an empty bttle, the air pressure inside the bttle matches the air pressure utside, s nthing happens. But when yu pur sme ht water int the bttle, it causes the air inside t heat up and expand rapidly, s sme f the air in the bttle gets ut. When the egg is put n the bttle, the air pressure utside f the bttle pushes the egg int the bttle. The result is an unbalanced frce – the frce f the air pushing n the egg frm utside the bttle is greater than the frce f the air pushing up n it frm inside the bttle. As a result, the egg is pushed int the bttle.
Backgrund infrmatin
【文体解读】话题特点实验报告是把实验目的、方法、过程、结果等记录下来, 经过整理写成的书面汇总材料。实验报告要明确体现实验目的、步骤和结果, 对具体实验现象的描述要客观准确, 分析要全面具体, 语言要简洁质朴、通俗易懂。
Experiment reprt
—— The aim f the experiment.
—— The materials used in the experiment and the explanatin f the prcedure.
——The results f the experiment and smething yu have learned.
Step 2Activity 6 Cmplete the bxes with the infrmatin in Activity 5. D further research if necessary.
话题词汇①d/ carry ut/ cnduct an experiment 做实验②aim 目的; 目标 ③material材料④prcedure步骤 ⑤stage 阶段⑥result 结果 ⑦draw/ cme t a cnclusin 得出结论
Intrductin:This experiment is designed t prve whether air pressure really exists.Main bdy: I prepared the materials, including a biled egg, a glass bttle whse neck is a bit smaller than the egg, and sme ht water t d this experiment.Prcedure: First, I remved the shell f the egg. Then, I carefully pured sme ht water int the bttle, and shk the bttle gently. After a few minutes, I pured ut the ht water. Just at the same time, I quickly placed the egg n tp f the bttle. Cnclusin:After the experiment, I can draw the cnclusin that air pressure indeed exists, and it is very pwerful. It is the frce f the air that pushed the egg int the bttle.
Structure f the passage
Pssible versinThe experiment is designed t prve whether air pressure reallyexists. At the beginning f the experiment, I prepared the materials, including a biled egg, a glass bttle whse neck is a bit smaller than the egg, and sme ht water. With all the things prepared, the experiment began. First, I remved the shell f the egg. Then, I carefully pured sme ht water int the bttle, and shk the bttle gently. After a few minutes, I pured ut the ht water. Just at the same time, I quickly placed the egg n tp f the bttle. T my amazement, the egg squeezed int the bttle at nce. After the experiment, I can draw the cnclusin that air pressure indeed exists, and it is very pwerful. It is the frce f the air that pushed the egg int the bttle.
Recite these sentences 1.这个实验是为了证明空气压力是否真的存在。 The experiment is designed t prve whether air pressure really exists.2. 在实验开始时，我准备了材料，包括At the beginning f the experiment, I prepared the materials, including ……3.一切准备就绪，实验开始了。首先……With all the things prepared, the experiment began. Firstly……4.然后，我小心翼翼地往瓶子里倒了一些热水，轻轻地摇晃着瓶子。Then, I carefully pured sme ht water int the bttle, and shk the bttle gently. 4.使我惊奇的是，鸡蛋立刻被挤进了瓶子。T my amazement, the egg squeezed int the bttle at nce. 5.经过实验，我可以得出结论，空气确实存压强在，而且是非常强大的。是空气的力量把鸡蛋推进了瓶子。After the experiment, I can draw the cnclusin that air pressure indeed exists, and it is very pwerful. It is the frce f the air that pushed the egg int the bttle.
Cnclusin:1. Review Present Perfect Passive2. Learn the structure and the write prcedure f an experiment reprt.3. Learn hw t write an experiment reprt