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Unit 4 Astronomy：the science of the stars 【热点话题】(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】roadening_of_human_ knowledge② 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 sufficient knowledge，we can't_meet_the_future_needs③ and can't be what_we_are_expected_to_be.④ We are_required_to_do⑤ 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。人类文明是科技发展的结果。he 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。我们必须拓宽这座桥以满足将来的需要。_the_future_needs．他辜负了大家的期待。人们要求青年尽可能多地掌握知识。 Ⅰ.按要求写出下列单词大气层 ．人造卫星 ．不同不像 气候 ．地心引力重力 ．理论 ．碰撞坠落 ．宇宙飞船 ．链子锁链 ．碳 ．暴力的猛烈的 暴力 ．暴力地猛烈地 adv生存 ．生存 ．伤害损害 ．有害的 无害的 生物学 ．gy | 
