10．We watched，________(amaze) as fire broke out on the outside of the spaceship ________ the earth's gravity increased.

　　now

　　amazed

　　as

　　五、课文内容理解

　　根据课文内容，请用适当的词或短语的正确形式填空。

　　As the result of “Big Bang”， the violent earth slowly settled into a 1.________ moving around the sun.The gasses which were to make the earth's 2.___________came into being from the 3.________ of the dust ball, with water following them while the earth 4.________ down.It allowed the beginning for life.Millions of years later, the first extremely small plants began to appear on the 5.________ of the water, 6.____________ and filling the sea and oceans, which encouraged the later development of early shellfish and all sorts of fish.As time passed, green plants taking 7.____________ and producing

　　globe

　　atmosphere

　　explosion

　　cooled

　　surface　

　　multiplying

　　carbon dioxide　

　　8.________came to land and grew into forests.Later the 9.________ of lives continued, such as insects, amphibians, reptiles, dinosaurs and 10.________， the typical of which is human being.They don't only do good to the earth but cause damage to it.

　　oxygen

　　chains

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