1、Unit 1 Tales of the unexplainedPart 1: Teaching DesignAims and requirements Read a news story about a missing boy and a magazine article about Yeti Listen to a dialogue between a boss and his employee Talk about aliens and conduct an interview Write a report Tell a mysterious storyProceduresWelcome

2、to the UnitStep 1: Brainstorming1. Boys and girls, have you ever heard something not only interesting and attractive but alsounexplained at all even with the help of modern science and technology in the world? Here are some pictures on the screen. Can you tell me what they are?The chances for seeing

3、 a UFO are greater for those people who live in small towns or in the country and are outside late at night. UFOs. Yes, they are called UFOs, meaning unidentified flying objects.UFOs come in all shapes and sizes. Some are only small spots of light that move in strange patterns across the night sky.

4、Some can be seen in the daytime are often disk- or saucer-shaped.UFOs were once seen in different parts of China. Look at some pictures on the screen, please.Do you think such kind of things mysterious ?Are you curious about them? Besides UFOs, can you list anything more unexplained youve ever heard

5、 or seen in your daily life?They are Yetis, the Loch Ness Monster, Stonehenge and the Pyramids in Egypt.2. Open your books and lets look at page one. Please read the instruction and focus on the five pictures and illustrations first. Then answer the following questions:Do the five pictures have some

6、thing in common? If so, what is it? (unexplained; no satisfactory answers; mysterious; no evidence.)Can scientists explain these phenomena?How do you feel about them? Are you a bit curious?3. Think of as many expressions as possible to answer the questions above. Try to make up some sentences and re

7、ad them to the class. I will also offer you some examples.They are mysterious because no satisfactory answers have been offered to explain them. Though these mysteries have puzzled people for a long time, they still show great interest in them.People feel puzzled by the mysteries.4. Report the infor

8、mation you have collected to the class. Your answers are quite different. Now we will use some of your answers as a prompt for a class discussion. For example, Teacher: What information have you got about UFOs?Student A:.Teacher: Do you think Student As information interesting? What about the inform

9、ation youve got? Is there anything different?Student B:.5. Please discuss the topics in pairs. Here are some questions.About UFOs:Have you ever read some reports about UFOs in China?Are you interested in UFOs?Are they really from another planet? What do the letters UFO stand for? Why do you think UF

10、Os visit our planet?About Yetis:Where are the Himalayas? Whats the weather like there?Why do some people make great efforts to climb them?(hobby; dream; challenge themselves; make discoveries; overcome difficulty,.)A Yeti is reported to be half-man and half-beast. Have you heard of it?Do you think s

11、ome climbers disappearances are connected with Yetis?About Stonehenge, the pyramids and the Loch Ness Monster:Stonehenge and the pyramids in Egypt, the most famous of which is the Great Pyramid, are cultural relics.Where were the pyramids built, on the east coast of the Nile or on the west coast?Wha

12、t are the reasons?Do you think the Great Pyramid is a wonder in human history? How was the Great Pyramid built?I havent heard of Stonehenge or the Loch Ness Monster. They are a bit new to me. What about you?Would you be interested in discovering more about them?Step 2: Sharing information1. Lets dea

13、l with the questions in pairs. For the first question, you may discuss it this way: Do you believe in UFOs? What might be the most acceptable explanation for UFOs? You may give different answers such as:-Aliens from space.-Military test aircraft.-Some UFOs are alien, some are test aircraft.-UFOs are

14、 evidence of human space travel.-UFOs are neither alien nor test aircraft.-UFOs dont exist.You can express your agreements and disagreements with each other.2. Summarize your answers and then report to the class.Sample answers1. I have a firm belief in UFOs. In fact, I have seen a few myself. UFO st

15、ands for Unidentified Flying Object, that is, an object, apparently moving in the sky, which we cannot identify. However, if you ask me whether or not I believe in spacecraft carrying visitors from outer space, I would have to say no. I do not believe in them.2. The continent of Antarctica was disco

16、vered in 1818. It was once supposed to have been covered by ice for hundreds of thousands of years. However, in 1949 scientists took samples from sediment deep beneath Antarctica, which revealed that great rivers had once flowed into Antarctica until about 6,000 years ago, Many more mysteries remain

17、 to be discovered.3. Im always interested in the stories of UFOs and aliens. And I hope I will have the chance to meet one some day. If it really happens to me, I will ask questions such as Who or what are you?, Where are you from? and How long does it take to travel from your place to our planet?.

18、I will try my best to communicate with them, discovering what their life is like and why they have come to the earth.UFOsUFO stands for Unidentified Flying Object. According to some witnesses, it is colorless and moves at a slow, steady speed with little noise.The Loch Ness Monster Loch Ness is a bi

19、g lake in Scotland. Nessie, the Loch Ness Monster, was sighted as far back as the 6th century AD.YetisThe Yeti has been called the missing link; half-man, half-beast. It is supposed to live in the highest mountain in the world-Mount Qomolangma.Stone-hengeBeing one of Britains greatest national icons

20、, it stands for mystery and power. Some people guess that it was a temple for worship. The reason why Stonehenge was built remains unknown even today.The Great PyramidThe Great Pyramid of Khufu is one of the seven wonders of the ancient Great world and the only one people can visit. It is the greate

21、st of the Egyptian pyramids, which served as burial places for the Pharaohs.第十三章：干燥通過本章的學習，應熟練掌握表示濕空氣性質的參數，正確應用空氣的HI圖確定空氣的狀態點及其性質參數；熟練應用物料衡算及熱量衡算解決干燥過程中的計算問題；了解干燥過程的平衡關系和速率特征及干燥時間的計算；了解干燥器的類型及強化干燥操作的基本方法。 二、本章思考題1、工業上常用的去濕方法有哪幾種？態參數？11、當濕空氣的總壓變化時，濕空氣HI圖上的各線將如何變化? 在t、H相同的條件下，提高壓力對干燥操作是否有利? 為什么?12、作為干燥介質的濕空氣為什么要先經預熱后再送入干燥器？13、采用一定濕度的熱空氣干燥濕物料，被除去的水分是結合水還是非結合水？為什么？14、干燥過程分哪幾種階段？它們有什么特征？15、什么叫臨界含水量和平衡含水量？ 16、干燥時間包括幾個部分？怎樣計算？17、干燥哪一類物料用部分廢氣循環？廢氣的作用是什么？18、影響干燥操作的主要因素是什么？調節、控制時應注意哪些問題？三、例題例