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Unit 4 Astronomy：the science of the stars
【热点话题】
science and modern technology(科普知识与现代技术) 知识与人类文明 体裁：说明文 写作思路：
科技的发展对人类文明的贡献——学习知识的重要性 【美文诵读】
Human civilization is_mainly_attributed_to the achievements of science and technology.With_the_broadening_of_human_
knowledge we know more and more about the world we are living in.Human beings use their knowledge to change the environment，utilize the natural resources，and create a fine world which is suitable for mankind.
As college students，we should learn as many kinds of knowledge as possible during our
stay
at
the
university.Without
③
②
①
sufficient knowledge，
④
we We
can't_meet_the_future_needs
⑤
and can't be what_we_are_expected_to_be.
are_required_to_do as much as we can to improve human life and society as well.
【学海拾贝】
按要求完成或翻译下列句子。 1．人类文明是科技发展的结果。
Human civilization is_attributed_to the development of science and technology. 2．随着经济的发展，中国在世界上起着越来越重要的作用。
With_the_development_of_economy，China is playing a more and more important role in the world.
3．我们必须拓宽这座桥以满足将来的需要。
We must broaden the bridge to meet_the_future_needs． 4．他辜负了大家的期待。
He didn't become what_he_was_expected_to_be．
5．人们要求青年尽可能多地掌握知识。
Young people are_required_to learn as much as they can.
Ⅰ.按要求写出下列单词 1．大气层 n．atmosphere 2．人造卫星 n．satellite 3．不同，不像 prep.unlike 4．气候 n．climate
5．地心引力，重力 n．gravity 6．理论 n．theory 7．碰撞，坠落 v．crash 8．宇宙飞船 n．spaceship 9．链子，锁链 n．chain 10．碳 n．carbon
11．暴力的，猛烈的 adj.violent 暴力 n．violence
暴力地，猛烈地 adv.violently 12