Unit 4 Astronomy: the science of the stars 单元要览 类别
话题
词汇
y
system
n. 系统; 体系; 制度
religion
n. 宗教; 宗教信仰
theory
论
atom
n. 原子
biologist
家
billion
pron. & n. & adj. （英）万亿; （美）十亿
puzzle
n. 迷; 难题 vt. & vi. （使）迷惑; （使）为难
globe
n. 球体; 地
gravity
n. 万有引n. 生物学
n. 学说; 理
biology dioxide
物
n. 生物学
thus
Science of the stars; the development of life; space travel and gravity
astronom
n. 天文学
exist
vi. 存在; 生存
adv. 因此; 于是
n. 二氧化
课程标准要求掌握的项目
球仪; 地球
violent
adj. 猛烈的; 激烈的; 强暴的
float
力; 重力
vt. & vi. （使）浮动; （使）漂浮 n. 漂浮物
carbon n. 碳 gentle adj. 温和的; 文雅的
atmosphere
unlike
n. 大气层; 气氛
prep. 不同; 不像
physicist
家
climate
n. 物理学
n. 气候
fundamental
harmful
adj. 基本的; 基础的
adj. 有害的
crash vt. & vi. 碰撞; 坠落
spaceship
船
n. 宇宙飞
acid n. 酸 pull n. & vt. 拉; 拖; 牵引力
chain n. 链子; 连锁; 锁链
satellite n. 卫星; 人造卫星
multiply vt. & vi. 乘; 增加
mass n. 质量; 团; 块; 大量
oxygen n. 氧 exhaust vt. 用尽; 耗尽
短语
solar system太阳系 in time及时; 终于
奋
lay eggs下蛋
give birth to产生; 分娩 in one’s turn轮到某人; 接着
block out挡住（光线） cheer up感到高兴; 感到振
now that既然 break out突发; 爆发 watch out密切注视; 当心; 提防
carbon dioxide二氧化碳
重要句型
prevent. . . from阻止; 制止
1. 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. (be to do; what-clause as the subject)
2. The earth became so violent that it was not clear whether the shape would last or not. (so. . . that; it is/was not+adj. +whether-clause)
3. What is even more important is that as the earth cooled down, water began to appear on its surface. (what-clause as the subject; that-clause as the predicative)
4. It was not immediately obvious that water was to be fundamental to the development of life. \\[it is/was (not)+adj. +that \\]