(
课件网) Unit 5 Look into Science 冀教版 英语九年级全一册 Lesson 28 The Study of Living Things 学习目标 Curriculum words： Chip Taylor, biology, butterfly, migrate, fantastic, completely Useful expressions： Fantastic facts about the butterfly have been drawing Dr. Taylor’s attention.Here, as many as 230 million butterflies spend the winter. Functions: Master the new words：Chip Taylor, biology, butterfly, migrate, completely, grandchild, female, milkweed, chemical, puzzling Grammar: almost的用法 Sentences: But in Mexico, people cut down the trees that the butterflies need to rest on because they want more land for farming.This is both puzzling and interesting for many scientists. 新课导入 Do you like nature, why 新课讲解 THINK ABOUT IT Would you like to be a biologist when you grow up？ Why or why not What mysteries of nature do you know about 课文呈现 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 Let ′s Do It ! Read the lesson and complete the table. 1 Fantastic facts about butterflies The butterflies always _____ to the same small piece of forest and _____ the winter there. return spend Fantastic facts about butterflies 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. lay Things that Dr. Taylor worries about In Mexico，people cut down the trees that the butterflies need to _____on. In the U． ... ...
