1、Unit 3 The world of science 表达作文巧升格 返首页课时分层作业2 实验报告实验报告属于说明文，主要用来说明实验的目的，过程以及实验的结果。全文可以分为三个部分，首先说明实验的目的和实验所需要的实验器材；然后说明实验所采用的方法，实验具体过程以及实验所得到的结果；最后根据实验的情况得出相应的结论。返首页课时分层作业3 基本框架 1开头(beginning)交代实验的目的和所需器材 2主体(body)介绍实验方法、过程及结果 3结尾(ending)写出实验结论 返首页课时分层作业4 常用词块 1make good preparations for the experim
2、ent 为实验做好充分准备 2do the experiment as follows 按照如下做实验 3find a better way of doing it 找到一个更好的方式来做 4be under observation 正在观察中 5make a good study 做好充分研究 返首页课时分层作业5 常用语句 精彩开头 1We carry out the experiment to find out why it rusts.我们做实验是为了发现它为什么会生锈。2The aim of the experiment is to find the cause of giving
3、away the gas.实验的目的是为了找到释放气体的原因。返首页课时分层作业6 3With the purpose of discovering how it reacts with acid，we carry out the experiment.为了发现它是怎么和酸发生反应的，我们进行了这次实验。返首页课时分层作业7 丰满主体 1Before we started，we prepared a candle，a glass，a basin and some water.开始之前，我们准备了一支蜡烛，一个玻璃杯，一个盆子还有一些水。返首页课时分层作业8 2The glass must be
4、 a little higher than the candle so that we can see the result more easily.玻璃杯必须比蜡烛稍高一点儿，以便于我们能够更容易看清结果。3We were astonished to see that the water level in the glass was higher than that in the basin.我们很吃惊地发现玻璃杯里的水位高于盆子的水位。返首页课时分层作业9 余味结尾 1We had an interesting experiment lesson.我们上了一堂非常有意义的实验课。2We w
5、ere greatly impressed with the process of burning.我们对燃烧的过程印象非常深刻。3The experiment introduced us a useful way of exploring the unknown field.这次实验为我们介绍了一种探索未知领域的有用的方式。返首页课时分层作业10 请根据下列内容，写一篇短文，说明整个实验的内容。实验目的：不打烂鸡蛋取走蛋壳。实验器材：一个玻璃杯，一个小锅，水，一个鸡蛋，醋(vinegar)约 250 亳升 返首页课时分层作业11 实验步骤：1把鸡蛋放在锅中煮十五分钟左右；2把煮熟的鸡蛋放到玻
6、璃杯中；3往玻璃杯中倒醋，醋要漫过鸡蛋；4让鸡蛋在醋中浸泡 24 小时。返首页课时分层作业12 实验结果：24 小时后，鸡蛋壳完全消失。实验结论：醋中的酸性物质(acid)与蛋壳中的碳酸钙(calcium carbonate)反应生成二氧化碳(carbon dioxide)蛋壳(shell)消失。注意：词数：80 左右。_ _ _ 返首页课时分层作业13 参考范文 The aim of the experiment is to move the shell from an egg without breaking the egg.To carry out the experiment,you
7、need the following things:a glass，a small pot/boiler,some water,an egg and about 250 ml vinegar.When all these things are ready,you can begin the experiment.First,boil the egg for about 15 minutes in a pot filled with water.Next,place the egg in the glass and cover it with vinegar.After that，leave t
8、he egg in vinegar for 24 hours.返首页课时分层作业14 24 hours later,you can see the shell disappear completely.The egg shell disappears because it is made up of calcium carbonate while the vinegar is an acid.The two substances react to form the gas,carbon dioxide.返首页课时分层作业15 点击右图进入 课 时 分 层 作 业 Thank you for watching!
