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1、Unit 4 Astronomy:the science of the stars【学习目标】i.熟读课文了解地球生命的发展史。2.学会分析长短句子 3.背诵下列词组和句子 课前自主学习：| （在文章中找到以下短语翻译并背诵。）think about, in solar system, are interested in the origin of life, on earth, religion and culture a widely accepted theory,in all directions, a cloud of dust, become violent, settle int
2、o the solid globe, in time, explode loudly, produce the water vapor, cool down on other planets make the earth s atmosphere, , on the surface,be fundamental to,dissolve harmful gases into the ocean, a chain reaction, fill with grow on land. land animals encourage the development of,live on land live
3、 in the sea, grow into forests,for the first time produce young, lay eggs,remain a mystery. be different from in the pastgive birth to produce milkanimals with hands and feets spread all over the earth,in their turn, take care of, put into , prevent from escape from into as a result of this become t
4、oo hot to live on depend on solve a problem课堂巩固练习。一.分析句子1 .No one knows exactly how the earth began, as it happened so long ago. as it happened so long ago 在句中作翻译：.2 . .The earth became so violent that it was not clear whether the shape would last or not. 本句是 so- that 结构，意为。其中that从句中的 it 为 主语。真正的主语为
5、 翻译：.3 . However, according to a widely accepted theory, the universe began with a Big Bang that threw matter in all directions.定语从句翻译：.4 . What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe. What 弓 I 导 从句, was to become翻译：.5 . Th
6、e earth became so violent that it was not clear whether the shape would last or not. 本句中it为 主语。真正的主语为 翻译：.6 . They were intime to produce carbon, nitrogen, water vapour and other gases, which were to make the earths atmosphere. 翻译：.7 . What is even more important is that as the earth cooled down, wa
7、ter began to appear on its surface.本句是由 what引导的 从句在整个句子中做 语，that引导的是 从句。而在 that从句中，as引导的是 从句。翻译：.8 . It was not immediately obvious that water was to be fundamental to the development of life.本句中 it 为 主语。真正的主语为。翻译： .9 .What many scientists believe is that the continued presence of water allowed the
8、earth to dissolve harmful gases and acids into the oceans and seasWhat 引导 从句 ,that 引导 从句翻译： .10 This produced a chain reaction ， which made it possible for life to develop.本句是由引导的非限制性定语从句。从句中的it 为 语， possible 为 语， 可以构成make it +n/adj for sbto do sth.除了 make有这样的用法外，还有 find,等动词。翻译： .11 .They multiplied
9、 and filled the oceans and seas with oxygen, which encouraged the later development of early shellfish and all sorts of fish.定语从句翻译： .12 . Why they suddenly disappeared still remains a mystery.翻译： .13 .They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping fr
10、om the earth into space定语从句翻译： .14 .As a result of this, many scientists believe the earth may become too hot to live on.宾语从句是翻译： .14. Whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.本句中有两个 whether,第一个引导 从句，第二个引导的是 从句。翻译： .二能力提升1. 背诵并默写第二段及最后一段。Homework 课本P27 页第三题