(
课件网) Lesson 28: The Study of Living Things Unit 5 Look into Science 单词: Chip Taylor, biology, butterfly, migrate, fantastic, completely, grandchild, female, milkweed, chemical, puzzling 短语: grow up, just like, cut down, divide into 句子: （1）Fantastic facts about the butterfly have been drawing Dr. Taylor’s attention. （2）The butterflies that return to the south are the great-great grandchildren of the butterflies that left for the north. Learning Goals 1 能用英语流利地讲述生物学常识和大自然的奥秘。 2 Free Talk Would you like to be a biologist when you grow up What mysteries of nature do you know about Why or why not Presentation Dr. Chip Taylor teaches biology at a university in the United States. He studies one kind of North American butterfly. Just like a migrating bird, this butterfly travels about 4 000 kilometres south in fall. Fantastic facts about the butterfly have been drawing Dr. Taylor’s attention. Butterflies are beautiful. What do you know about them In Mexico, the butterflies always return to the same small piece of forest, which is only 20 kilometres wide. Here, as many as 230 million butterflies spend the winter. They can cover some trees almost completely. The butterflies that return to the south are the great great grandchildren of the butterflies that left for the north. When they begin to travel north in spring, the females lay eggs. They lay eggs on only one plant: milkweed. But in Mexico, people cut down the trees that the butterflies need to rest on because they want more land for farming. In the United States and Canada, farmers use chemicals that kill milkweed. This worries Dr. Taylor a lot. Now things are improving. Mexico has begun to protect parts of its forests. The United States and Canada have encouraged farmers to use less chemicals. Scientists still don’t understand how the butterflies know when to fly south. If they are even a few days late, they will freeze. And how do all the great -great grandchildren find the same forest in Mexico every year This is both puzzling and interesting for many scientists. There are many mysteries yet to be discovered by those interested in science. Would you like to study biology Vocabulary Chip Taylor 奇普 泰勒（人名） biology n. 生物学；生物 butterfly n. 蝴蝶 migrate v. 移居；迁徙 fantastic adj. 奇异的；了不起的；极好的 Vocabulary completely adv. 完全地 grandchild n. 孙子；孙女；外孙；外孙女 female n. 雌性的动物或植物；女子 milkweed n. （植）马利筋 chemical n. 化学物质 puzzling adj. 令人费解的 grow up 长大 just like 就像；正如 cut down 砍倒 divide into 将……分成…… Structures and Expressions Let’s do it! 1. 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 _____ egg ... ...
