流程图补充教材.ppt

流程图 1. 生产类型； 2. 循环类型； 3. 工作原理类型； * 重点 1. 被动句； 2. 一般现在时态； 3. 定语从句； 4. 不能使用祈使句； 5. 词汇量起到了一定的作用； 制作流程 There are two diagrams showing the production of cement and concrete. The first one shows a series of steps through which cement is produced. The whole process begins with the preparation of raw materials which are limestone and clay. After that, the two substances go through a crusher and are crushed into powder. When it comes to the third stage, the powder enters into a mixer in which it is fully mixed. Heating is the fourth step at which the mixture is heated with extremely high temperature in a rotating heater. It is noticeable that the heater works clockwise. Before the whole process comes to the end, the heated mixture travels through the grinder and becomes the final product—cement. At last, cement is packed in bags and used for constructional purposes. The second diagram gives information about the production of concrete with four kinds of materials. Of the four ingredients, gravel occupies the largest proportion (50%), compared with 10% of water and 15% of cement. Sand makes up for the other 25%. The process of concrete production takes place in a mixer that works in (counter)clockwise direction. Overall, it takes six main steps to produce cement and the production of concrete requires four kinds of materials. 完全适用 循环过程 * 最开始，飞蛾会在树叶上产卵。十天以后，这些卵变成silkworm larva， 他们吃叶子当做食物。又过了4-6周之后，这些larva开始吐丝来缠绕在自己身上。这个过程持续3-8天，知道他们把自己完全变成了cocoon。16天之后，一只moth会从一个cocoon里出来。这就完成了一次life cycle。 复杂功能 * 1. 这个图表展示了一个house的heating system如何工作。 2. 冷水从屋顶的管道进入house, 然后在boiler里面被加热。热水有两个主要用途。 3. 一方面，热水flow to各个房间的暖气散热片，对房间进行加热。水变凉之后，会被pumped back to the boiler。 4. 另一方面，一部分热水被储存在storage tank里面。house里的人们可以通过tap来使用这些热水。 5. 总的来看，这个加热系统满足了两个主要的目的。 The picture illustrates the process of producing electricity in a home using solar panels. At the first stage in the process, solar panels on the roof of a normal house take energy from the sun and convert it into DC current. Nex