第一课时 阅读理解
概要：学理论不同，它甚至不是科学假设，但因为是故事，有情节且趣味性强，因而为学生所爱。）老师要充分估计学生可能的讨论结果，准备相关的图片、视频或材料，以备小组呈现结果时用。或者让学生提前准备，把其中的个别故事排演成英文短剧，展示给学生看。1) Legend: Pangu creates the world2) Science: The Big Bang（大爆炸）Scientists believe that around 15 billion years ago, a huge explosion happened, creating our universe.There are several famous scientists such as Newton, Einstain and Stephen Hawking. They all have their own opinions on the universe.第二步：观看关于太阳系的短片( about two minutes )。目的在于把生命的起源从各种传说故事中慢慢地回归到科学事实上。同时也为课文提供了深刻的背景知识。第三步: 课文的整体听力理解，完成单项选择。1
第一课时 阅读理解,http://www.170xuexi.com第一步：引入本单元的话题
方案一:
可以直接利用课本热身部分提供的问题来引出话题，如：要求学生discuss in groups which science subjects are part of medicine, biochemistry, geophysics or astronomy, and what are the most important skills we need to be real scientists? 这一方案开门见山,不仅能很快切入本单元的主题,而且问题指向明确,学生比较容易展开话题。
方案二：
可以利用其他更为生动、灵活的方式如：以How life began on the earth?为任务主题，要求四人小组讨论，自由交谈引入话题，要求自圆其说，并稍后呈现小组讨论结果。（关于宇宙和人类的起源，不同的文化有不同的传说。传说与科学理论不同，它甚至不是科学假设，但因为是故事，有情节且趣味性强，因而为学生所爱。）老师要充分估计学生可能的讨论结果，准备相关的图片、视频或材料，以备小组呈现结果时用。或者让学生提前准备，把其中的个别故事排演成英文短剧，展示给学生看。
1) Legend: Pangu creates the world
2) Science: The Big Bang（大爆炸）
Scientists believe that around 15 billion years ago, a huge explosion happened, creating our universe.
There are several famous scientists such as Newton, Einstain and Stephen Hawking. They all have their own opinions on the universe.
第二步：观看关于太阳系的短片( about two minutes )。目的在于把生命的起源从各种传说故事中慢慢地回归到科学事实上。同时也为课文提供了深刻的背景知识。
第三步: 课文的整体听力理解，完成单项选择。
1.在播放课文听力材料之前，让学生浏览听力理解的问题。
1）Why was the earth different from other planets?
A. It produced a lot of heat.
B. The water remained.
C. Water disappeared.
D. It was the oldest planet.
2） Why was life able to develop on the earth but not on other planets?
A. The earth had a solid shape.
B. The earth did not have harmful gases in its atmosphere.
C. The water stayed on the earth but not on other planets.
D. The earth was not too hot and not too cold.
3）Why was it necessary for plants to grow before animals?
A. Animals needed plants to protect them from the sun.
B. Plants provided oxygen for animals to breathe.
C. Animals could hide from hunters in forests.
D. It was easier for plants to grow.
4）What problem is caused by human beings?
A. They exist every where on the earth.
B. They cause global warming.
C. They find new methods of growing crops.
D. They enjoy hunting and fishing.
2.让学生听录音答题。
3. 让学生确认答案。
4. 让学生讨论听力理解答案。
第四步: 分段细读文章，检测理解。
1. 带着问题细读第一段。
Suggested questions:
1） How did water come into being on the earth?
2） What is the significance of the presence of water on the earth?
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