外研社2019高中英语选择性必修一Unit5Revealing Nature整单元学案

新外研社版高中英语选择性必修一 Unit5 Revealing Nature整单元学案 Starting Out&Understanding Ideas学案设计 学习目标 1.Understand key information by watching the video,learn and master the useful expressions; 2.Strengthen reading ability by skimming,scanning and summarising to solve comprehensive problems related to the passage; 3.Analyse the textual structure and linguistic features of the text,and then use the relevant language to express yourself. Step Ⅰ　Lead-in Look at the pictures Look at the page from a science magazine and answer the questions. UNUSUAL ANIMALS TODAY Komodo dragon: Komodo dragons were first encountered by Western researchers in 1910. The researchers said the ancestor of the Komodo dragon most likely evolved in Australia and spread westward,reaching the Indonesian island of Flores 900,000 years ago. Duck-billed platypus: The first scientists to examine a preserved platypus body judged it a fake in the late 18th century. The oldest discovered fossil of the modern platypus dates back to about 100,000 years ago. Nautilus: Fossil records indicate that the nautilus has survived relatively unchanged for around 500 million years.It is often considered a “living fossil”. Questions: 1.What do you know about these animals?What makes them special? 2.What other similar animals do you know about?Share your knowledge with the class. 背景补充: The Komodo dragon The Komodo dragon is the largest lizard in the world.It can grow to three metres in length and can weigh about 135 kilograms.Despite its size and weight,it can run for short distances at up to 20 kilometres per hour. The Duck-billed platypus The duck-billed platypus is a small egg-laying mammal (up to 60 cm in length) found only in Eastern Australia including Tasmania.As its name suggests,it has a mouth that looks like a duck’s bill,while its thick fur and flat tail are similar to those of a beaver. Nautilus As one of the oldest sea animals in the world,the nautilus has hardly changed in about 500 million years,and that is why