Unit 4 Astronomy: the science of the stars单元要点预览(旨在让同学整体了解本单元要点)词汇部分词语辨析1. loudly / loud / aloud 2. unlike / dislike 3. remain / leave4. climate / weather 5. now that / since / because / as 词形变化1. violent adj.强暴的,猛烈的violence n. 暴 力 , 强暴;猛烈violently adv. 强暴地;猛烈地2. fundamental adj. 基 本(础)的 n.[pl.]基本原则(法则) fundamentally adv. 基本地;根本地 fundament n. 基础;根本3. development n.生长,发展;新情况develop vt.发展;产生 vi.生长;发展developed adj. 发达的developing adj. 发展的4. lay vt.放下;摆设;产(蛋) lay---laid---laid---layinglie vi. 躺,平放;位于lie---lay---lain---lyinglie n.&vi. 谎话;说谎lie---lied---lied---lying5. prevent vt. 预防,防止prevention n.预防;阻止;妨碍preventable adj.可防止的,可预防的6. gentle adj.和蔼的;轻柔的gently adv.温和地;静静地7. physics n.物理,物理学physicist n.物理学家physical adj.身体的;物理(学)的;物质的 重点单词 1. system n.[c] 系统;体系;制度;方法 2. lay vt. (laid, laid, laying) 把……放下;摆设;铺(地毯) ;产(蛋)3. harmful adj. 有害的;伤害的 4. exist vi. 存在;生存 5. puzzle v.(使)迷惑;(使)苦思 n.谜;难题6. pull v.拉,拖,拔;移动 n.拉,拖;拉(引)力7. cheer vt.&vi. (使)高兴、振奋;(对)欢呼 重点词组1. to begin with 以……开始;由……作为开头;首先2. in time 及时;最终;迟早3. in one’ s turn 轮到某人;接着4. prevent...from 使……不做事;阻止……做某事5. block out 挡住(光线)6. be off = set off 出发;动身;不用上班/学/开张7. break out (灾难、战争等)突发;爆发8. watch out 密切注视;当心;提防 重点句子1. It exploded loudly with fire and rock, which were in time to produce the water vapour, carbon dioxide, oxygen, nitrogen and other gases, which were to make the earth’ s atmosphere.2. That made it possible for life to begin to develop.3. But when I tried to step forward I fou...