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课件网) Unit 5 Look into Science Lesson 28 学习目标 To understand the meaning and usage of the new words and expressions. 01 To review the usage of Attributive Clauses. 02 To learn to study nature and enjoy science. 03 Do you know who the man is Charles Darwin. What does he do He’s a famous biologist. 新课讲授 Would you like to be a biologist when you grow up Why or why not What mysteries of nature do you know about Chip Taylor biology n. butterfly n. migrate v. fantastic adj. completely adv. 奇普 泰勒 生物学; 生物 蝴蝶 移居; 迁徙 奇异的;了不起的;极好的 完全地 Presentation grandchild n. female n. milkweed n. chemical n. puzzling adj. 孙子; 孙女; 外孙; 外孙女 雌性的动物或植物; 女子 (植)马利筋 化学物质 令人费解的 Presentation grandchild milkweed completely biology female fantastic chemical butterfly migrate puzzling Look and read the words. Practice Listen and answer the questions. 1. When do the butterflies travel to south 2. How far do they travel 3. When do they travel north The butterflies travels to south in fall. About 4000 kilometers. They travel north in spring. Reading task Dr. Chip Taylor studies one kind of American butterfly. ( ) In Mexico, the butterflies always return to the same small piece of forest. ( ) The butterflies lay eggs on only plant: milkweed. ( ) Mexico has begun to protect all of its forest. ( ) F T Read the text and judge the sentences: F T Dr. Chip Taylor studies one kind of North American _____. It travels about _____ kilometres south in fall. In Mexico, as many as 230 million butterflies spend the _____. The butterflies that return to the south are the great-great _____ of the butterflies that left for the north. When they begin to travel north in spring, the _____ lay eggs on milkweed. In Mexico, people _____ _____ the trees that the butterflies need to rest on. In United States and Canada, farmers use _____ that kill milkweed. Now things are improving. Scientists still don’t understand how the butterflies know when to fly south or how all the great-great grandchildren find the _____ forest every year. 4000 grandchildren winter butterfly females cut down chemicals same Read the text again, then fill in the blanks. Discuss the questions in pairs: How do the butterflies know when to fly south How do the great-great grandchildren of the butterflies find the same forest Read the lesson and complete the table. Fantastic facts about butterflies The butterflies always _____ to the same small piece of forest and _____ the winter there. The butterflies that return to the south are the great great grandchildren of the butterflies that left for the north. The females _____ eggs on only one plant：milkweed. return spend lay Let’s do it! 1 Things that Dr. Taylor worries about In Mexico, people cut down the trees that the butterflies need to _____on. In the U.S. and Canada, farmers use chemicals that _____ milkweed. Things that scientists can’t understand How do the b ... ...
