Unit4 Astronomy: the science of the stars Period1

学习目标: 1阅读课文,了解生命的起源以及生命进化过程

2掌握语篇结构

自主学习 《非常学案》单词及短语

合作探究：

I.篇章结构：

阅读Reading部分，思考：

How life began on the earth

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II.语篇理解

阅读Reading部分，从每题所给的3个选项中选择最佳答案

1．What is the right order according to the text?

①Animals appeared and spread.

②The forming of the earth.

③Plants appeared.

④Difference between the earth and other planets.

A．②③④①　　 B．②④③①　　 C．③④②①

2．What is the main cause that life was able to develop on the earth but not on other planets?

A．The earth had a solid shape.

B．Water stayed on the earth but not on other planets.

C．The earth was not too hot or too cold.

3．From the last paragraph we can infer that the author is________.

A．confident B．sad C．concerned

4．What does the word "they" refer to in the sentences "It exploded loudly with fire and rock. They were in time to produce carbon, nitrogen, water vapour and..."？

A．Planets. B．Gases. C．Fire and rock.

5．It can be inferred from the text that________.

A．after the "Big Bang"， what the dust was to become remained a mystery