高中英语：unit2 cloing教学学案人教版选修8VIP专享

Unit2 cloningWarming up:1．Use your own language to describe the four pictures.Picture1. ---It is the most famous sheep in the world. Do you know how Dolly is different from other sheep?___________________________________________________________________ Picture2. ---what can you see in the picture? ____________________________________________________________________ _ Picture3. ---who cut the stem off the plant? What is he going to do?_____________________________________________________________________ picture4 ---what do you know bout twins?_____________________________________________________________________ Cloning can be divided into two kinds:------ is one that occurs from the “parent” in a natural form of cloning without human help. ------- is one that produced through human intervention(介入) .2. language pointsDiffer: 3. What is cloning? Pre-readingHow is a clone produced?The cloning of plants is simple and relatively easy. It can be done by taking cuttings (man-made cloning) or letting the plant produce its own runners (natural cloning). The cloning of animals is more complicated. It was not achieved until 1996 and is fully explained in the first reading.ReadingStep1. Skimming What’s the text mainly about? Write the letter “T” if the statement is true. Write “F” if it is false.11. Cloning means making a copy of an animal or a plant.2. Gardeners can make a lot of money by cloning plants.3. Cloning animals is as complicated as cloning plants. 4. Dolly the sheep was the first successful clone of a mammal5. Natural clones happen in animals as will as in plants.Step2. Find the main idea of each paragraph.1. Cloning is ______________________________ 2. Cloning has ____________ uses.3. The _________ of Dolly.4. The...