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...
