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《astronomy the science of the stars》课文原文
No one knows exactly how the earth began,as it happened so long ago.However,according to a widely accepted theory,the universe began with a "Big Bang" that threw matter in all directions.After that,atoms began to form and combine to create stars and other bodies.
For several billion years after the "Big Bang",the earth was still just a cloud of dust.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.The earth became so violent that it was not clear whether the shape would last or not.It exploded loudly with fire and rock.They were in
time to produce carbon,nitrogen,water vapour and other gases,which were to make the earth's atmosphere.What is even more important is that as the earth cooled down,water
began to appear on its surface.
《astronomy the science of the stars》课文单词
1. theory
in theory 理论上 in practice 实际上
Your plan is good in theory, but it doesn’t work in practice.
2．in time
1) The storm was in time to stop before the sports meeting. 终于
2) You’d better return it in time. 及时
3) You’ll learn how to do it in time. 迟早，总有一天
on time
3. unlike \ dislike
Unlike John, Tom dislikes playing football.
4. harmful
be harmful to 对……有害
The sun can be harmful to your skin.
Smoking is harmful to your health.
harm n & v 损害，伤害 do harm to对……有害
harmless adj. 无害的
5. in one’s turn
When it’s in my turn, I’m too excited to speak.
He cooked the meal in his turn this week.
by turns 轮流
We drove the car by turns.
in turn 依次，反之
They gave their names in turn.
take turns to do sth 轮流做某事
