高一英语必修三Unit 4Unit 4 Astronomy：the science of the star Reading 说课稿
课题：Reading: How Life Began on the Earth
I 教学内容分析
本单元的中心话题是“天文学”。本课是一篇叙述性文体,按照时间顺序主要叙述了地球上生命的起源和发展过程。可以说科学知识含量较高，更能激发学生的学习兴趣和好奇心。
Pre-reading 部分也提出了三个问题，主要是让学生区分宗教信仰、文化传统和科学思想之间的不同。可以以讲故事的方式让学生彼此之间分享一些有关宇宙和地球起源方面的传说或故事，这样既能激活他们的思维也能为阅读部分打下基础。
Reading 部分描写了地球上生命的起源和发展过程，具体写了由于水的形成才使得地球上生命的诞生成为可能。科学家认为，地球上的生命最初诞生于水中。数万年后，陆地上才长出了绿色植物，随后出现了陆栖动物和水陆两栖动物。最初的动物靠孵化繁衍后代，再之后诞生了哺乳动物，人类也随之诞生了。文章最后讲述的现象发人深省：The earth may become too hot for the lives on it.它关系到地球上生命的未来。
II．教学重点和难点
1．教学重点
（1）本单元的生词、短语和句型结构；
（2）掌握主语从句并把它和表语从句进行区别；
（3）学会运用科学知识并能结合自己的想象力去解决现实中的问题。
2．教学难点
（1）通过学习相应的科学知识培养学生的创造性思维能力；
（2）学生应能够理解主语从句的用法和作用并能做到学以致用，举一反三。
III. 教学步骤：
Step 1 Revision
Purpose :Let the students have a clear awareness of the text.
Revise the new words and phrases by a dictation.
Asking questions:
How many planets are there in solar system?
What are they?
Step 2. Fast reading
Purpose: To get the list of the passage.
To correctly understand some information given in the text.
1. Ask Ss to read the text quickly and try to get the main idea of the text.
Suggested Answer:
The main idea of the text is the title — How life began on the earth. 2. Ask Ss to work in pairs and discuss the questions of Ex1 on P27. And then let them check the answers in pairs.
Step 3. Intensive reading
Purpose: to get the students to learn the details of the text.
(1) Answer the questions:
•When did the “Big Bang” happen?
•What form was the earth the “Big Bang”?
•What made up the earth’s atmosphere after the earth exploded?
•How did water come into being on the earth?
•What was important to the development of fish?
•What made possible the rise of mammals on the earth?
•Why are mammals different from all life forms in the past?
（2）Fill in the chart about the order of development of life.
Suggested Answers:
① Small plants in water ② Shellfish and all sorts of
fish ③ Green plants on land
④ Insects(on land) ⑤ Amphibians(on land and in water) ⑥forests ⑦ reptiles(on land)
⑧ dinosaurs(on land) ⑨ mammals(on land) ⑩ human beings
Step 3 Explanation
Purpose:Help Ss analyze some difficult, long and complex sentences and guess the meanings of the new words.
Ask the studentsto underline the difficult sentences and analyze them and take notes.
Pick out all the useful expressions and copy them.
Step 4 Read aloud
Ask Ss to read the passage aloud after the tape and let them pay more attention to the pronunciations of each new sentence.
Step 5 Homework
Preview the next period.and recite the last three paragragh.
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