If you heat a metal, what change will happen?
What is steel made from?
What is the earth's surface mainly covered by?
How far is the sun from the earth?
How old is the earth?
Which is larger, the earth or the moon?
(2)Ask the students to listen to the tape and find out the answers to these questions.
(3)Put the students into pairs or groups of four and compare their answers.
(4)Call back the answers from the class.
Suggested answers:
Water exists as a solid, a liquid and a gas.
When you heat a metal, it expands.
Steel is a mixture of iron and other substances.
Twothirds of the earth's surface is water.
The distance of the sun from the earth is 150,500,500 km.
The earth is 4.6 billion years old.
The earth is fortynine times larger than the moon.
●教学流程设计
导入新课。→学生阅读“美文阅读”与“诱思导学”(见学案第57页)。→学生就“美文阅读”进行讨论,统一答案。→让学生快速阅读课文(见课本第44~45页),并完成“篇章结构”(见学案第57页)。→师生共同讨论并统一答案。→学生再次阅读课文(见课本第44~45页)并完成“语篇理解”(见学案第58页)。→学生共同讨论,并让学生发表各自见解,最后统一答案。→学生再次仔细阅读课文(见课本第44~45页),进行深度理解,并完成“课文缩写”(见学案第58页)。→老师指导学生讨论,共同找出答案。→让学生完成“知识初探”部分(见学案第58页)。→学生讨论,并让学生代表发表他们讨论得出的答案。老师予以更正。→让学生根据所给出的表格进行自我评估(见学案第58页)。→
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