课件25张PPT。Unit 4 Astronomy: the science of the stars Language pointssystem n. 系统；体系；制度 They have a warning system in the house. The legal system are quite different in these countries. solar system 太阳系 systematic adj. 有系统的；系统化的2. However, according to a widely accepted theory, the universe began with a “Big Bang” that threw matter in all directions. begin with=start with：“以……开始”. to begin with=to start with 以…为起点; 开始(做) 这两个词组都可以单独使用,表示“首先; 第一; 起初; 最初”。 在句中作时间状语。 e.g. To begin/start with, I couldn’t like him at all. 3. They were in time to produce carbon,…, which were to make important is in time: 及时;最终 in time (for sth. /to do sth.): 及时；不迟 我迟早会遇见他. I’ll see him_____. 她会及时回来准备晚餐. She will be back _____ to prepare dinner. 你认为我们能及时赶上火车吗?Do you think we can get there _____the train?in time forin timein time 与time相关的短语: in no time 立刻, 马上 at times 有时 at a time 每次;依次 once upon a time 从前 on time 按时;准时 at one time 从前 for the time being 暂时 from time to time 不时地 4. 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. What is even more important is that as the earth cooled down, water began to appear on its surface. [考点] 以上两句均为what引导的主语从句。1. _____（使大家吃惊的是）is that he didn’t come to the meeting. What surprised everybody 2. _____（他所做的）added to our difficulty. What he did 5. …as the earth cooled down, water began to appear on its surface. 随着地球的冷却, 地球的表面就开始出现了水。 1) cool down 变凉, 冷却,平息, 冷静 晒了一天的太阳之后, 他喜欢在海水中凉快 一下。 After a day in the sun, he liked to _____ in the sea. 他的话平息了她的怒气。 His words _____ her anger. cool downcooled down2) appear “出现, 似乎”是不及物动词当表示 “似乎, 好像”时是系动词, 该词无被动语态。 Our teacher appeared on TV this morning. The man who came yesterday appeared / seemed / looked an honest man. 6. It was not immediately obvious that water was to be fundamental to the development of life. 水会对于生命的发展起关键作用, 这一点在当时并不太明显。 用It做形式主语是因为that引导的从句较长, 如果按照正常语序来安排的话就显得头重脚轻了。如: It is no wonder that he has passed the exam. It is quite necessary for us to learn English well. 7. This produced a chain reaction, which made it possible for life to develop. Chain reaction 连锁反应 Make it possible for life to develop. 使生命的发展成为可能 make it + adj./n. for sb. /sth. to do sth. 老师让他们容易地明白那个问题。 The teacher _____. made it easy for them to understand the question8. They produced young generally by laying eggs. lay-laid-laid-laying 放, 把......放在......; 产卵 He laid his books on the desk. 注意: lay (laid; laid; laying) 放置;产卵 lie (lay; lain; lying) 躺;位于 lie (lied; lied; lying) 说谎 The naughty boy ___ to me that the hen that ___ there just now had ___ two eggs the day before ... ...
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