1、Understanding ideas Unit 5 Into the wild Pre-readingWatch and think:Background knowledge about monarch butterflyThe monarch butterfly,which lives in America,is probably one of the most well-known butterflies on earth.It has a famous name Monarch Butterfly.It is widely said that the dazzling orange w
2、ings of this butterfly reminded European colonists who first arrived in North America of the Prince of Orange(later King William III of England),hence the name Monarch Butterfly.生活在美洲地区的黑脉金斑蝶大概是地球上最广为人知的蝴蝶之一，它有一个响当当的名字“帝王蝶”（monarch butterfly）。一个流传甚广的说法是，这种蝴蝶耀眼的橘黄色翅膀令初到北美大陆的欧洲殖民者想到了建立丰功伟业的奥兰治王子（Princ
3、e of Orange，也即后来的英格兰国王威廉三世），“帝王蝶”因此得名。Do you know the names of these animals?monarch butterflySiberian crane red pandaAtlantic salmon killer whaleAfrican lionLook and choose the animals that migrate.monarch butterflySiberian crane red pandaAtlantic salmon killer whaleAfrican lionBackground knowledge
4、 about animal migrationAnimal migration is the relatively long-distance movement of individual animals,usually on a seasonal basis.It is the most common form of migration in ecology.It is found in all major animal groups,including birds,mammals,fish,reptiles,amphibians,insects,and crustaceans.The tr
5、igger for the migration may be local climate,local availability of food,the season of the year or for mating reasons.To be counted as a true migration,and not just a local dispersal or irruption,the movement of the animals should be an annual or seasonal occurrence,such as birds migrating south for
6、the winter;wildebeest migrating annually for seasonal grazing;动物迁徙是个体动物相对长距离的移动，通常是季节性的。这是生态学中最常见的迁移形式。它存在于所有主要的动物类群中，包括鸟类、哺乳动物、鱼类、爬行动物、两栖动物、昆虫和甲壳动物。引发迁徙的原因可能是当地的气候、当地的食物供应、一年中的季节或交配的原因。怎样才算作一次真正的迁徙，而不仅仅是局部的扩散或入侵？动物的迁徙应该是一年一度或季节性的，比如鸟类迁徙到南方过冬；为季节性食草每年迁徙的角马等；While-reading What is the main idea of the
7、 passage?A.The monarchs migration.B.The reasons for monarchs migration.C.Mexicos monarch.The main idea of a passage can be found from its title,the topic sentence,or even the pictures.Read the passage and find out what mystery the scientists have solved.The scientists have solved the mystery of how
8、monarch butterflies manage to travel a long distance and find their way to their destination.Choose where you are most likely to find the passage.1 In a scientific research paper about the monarch butterflys migration.2 In a popular nature magazine introducing the monarch butterfly.3 In a travel lea
9、flet encouraging peopleto visit North America.What s the writing style of the passage?A.Narration（记叙文记叙文）B.Argumentation（议论文议论文）C.Exposition（说明文说明文）D.Practical writing（应用文应用文）Read for the writing styleIllustrationsSentences in the textCause-effect(因果因果)This annual movement is called migration.One of
10、 the most wonderful migration is that of the North American monarch butterfly.travel around 4,000 kilometershas crashed by as much as 90 per centinsects with fine black and orange wingsPeople are destroying the natural environment.People have been working together toDefinition(下定义下定义)Example(举例子举例子)
11、Appearance(摹状貌摹状貌)Figure(列数据列数据)Comparison(作比较作比较)destroyingworking togetherPara.1 Paras.2-3 Para.4 Para.5 Match the main ideas.Careful reading Definition（定义）（定义）Para.1 Information about migration Why?Find the way to California or MexicoWhen?Para.2 Monarch butterflys migration Where?&How far?Measure
12、 the position of the sunPara.3 Monarch butterflys migration determine the way&reach the placesHow do they make it?direction da.The monarch butterfly is able to tell_ _.b.Using these two pieces of information,the monarch butterfly determines _.c.The monarch butterfly measures _ _with its eyes.d.The m
13、onarch butterfly reaches _ _.the time of the way to gothe position of the places where aday the sunit will spend the wintercbPara.3Complete the sentences with expressions from the passage.Then use the sentences to complete the cause-effect flow charts.Para.4 Monarch butterflys trouble&causes Trouble
14、Causese.Humans _ trees.f.The _ where monarchs can be found is destroyed.g.Humans use chemicals that _ that monarch caterpillars eat.h.The monarch butterflys population _ in the last few years.cut downnatural environment of many placeskill the plantshas crashed(by as much as 90 per cent)hegfPara.4Par
15、a.5 Measures to protect monarch butterfly MeasuresPost-readingThink and share:What impresses you most about the monarch butterfly?What can people do to help protect the monarch butterfly?Read and completeOf all mass migrations,that of the North American monarch butterfly is one of the most _(wonder)
16、.Every autumn _(million)of these beautiful insects manage _(travel)4,000 kilometres south and find ways to places _ they will spend winter.A team of scientists _(lead)by the university of Washington _(discover)that the monarch is able to tell the time of day _ uses eyes to measure the position of _ sun.The information _(allow)the butterfly to determine the way _(go).wonderfulmillionsto travelwhere ledhas discoveredandtheallowsto go
