Unit 5 Look into ScienceLesson 25: Let’s Do an Experiment!1I. Learning aims:Master the new words: experiment, jar, upside, pour, correct, scientific, method, raincoat, force, pressure, conclude II. Learning important and difficult points: 1) I cover the top with a piece of cardboard and hold it there.2) I am so sure of my theory that Brian can do the experiment over your head and I know you won’t get wet.3) The force of the air keeps the water in the jar.4) It is strong enough to hold the water.Language Points:1. I cover the top with a piece of cardboard and hold it there. 我用纸板把上面盖住然后托住它。
用法】 句式 cover…with…意为“用……覆盖……”，类似句式be covered with 表示“被……覆盖”，这是一个系表结构举例】①My mother covered the table with cloth. 我妈妈用布把桌子盖住了②The bed is covered with paper. 床上盖满了纸2. I am so sure of my theory that Brian can do the experiment over your head and I know you won’t get wet. 我对布莱恩在你头上做实验的理论很有把握，并且你不会湿的用法】这句话中的句式be sure of意为“对……有把握”；that Brian can do the experiment over your head是定语从句，修饰前面的名词theory举例】①Are you sure of this matter? 你对这件事情有把握吗？②This is the book that I borrowed from the library. 这是我从图书馆借的书3. It is strong enough to hold the water. 它力量很大足以把水托住。
用法】句中的enough to do…意为“足以……做某事”，这里的enough起副词作用，用在形容词或副词后作状语举例】Allan is old enough to go to work. 艾伦到上班年龄了Lesson 26: Keep the Candle Burning2I. Learning aims:Master the new words: holder, shallow, lighter, match, examine, oxygen II. Learning important and difficult points: 1) Let the candle burn for two or three minutes.2）When the candle stops burning, it has used up all the oxygen in the air.3）How far does it rise?4) Because about one fifth of the air is made up of oxygen, the water rises and fills about one fifth of the jar.Language Points:词汇详解1. When the candle stops burning, it has used up all the oxygen in the air. 当蜡烛停止燃烧时，它就用完了空气中所有的氧气了。
用法】use up意思是“用完、用光”，这是“动词 + 副词”短语这类短语用名词作宾语时，名词可用在副词前，也可用在副词后；用代词作宾语时，代词则必须用在副词前举例】I gave Li Ming a lot of pencils, but he has used them up already. 我给了李明很多铅笔，但他已经把它们都用完了2. Because about one fifth of the air is made up of oxygen, the water rises and fills about one fifth of the jar. 因为组成空气的成分大约五分之一是氧气，所以水会上升并且填充瓶子的大约五分之一用法】短语be made up of意为“由……组成”，后加名词或代词作介词宾语举例】This grade is made up of ten classes. 这个年级是由十个班组成的用法】句中的one-fifth意思是“五分之一”，这是一个分数分数的表达一般遵循以下规则：分子用基数词，分母用序数词；当分子大于一时，分母要用复数形式；并且其中的连字符号有时可以不要。
举例】one-fourth 四分之一 three fifths 五分之三Lesson 27: Planet Danny2I. Learning aims:Master the new words: telescope, solar, unless, double, mystery II. Learning important and difficult points: 1) Try looking through the other end.2) Maybe Brian and I can join you after supper.3) Scientists use huge telescopes when they look for planets.4) Well, it’s worth a try, even if I don’t find a planet.Language Points:1. double【用法】作可数名词，意为“两倍、双倍”，复数形式是doubles举例】Homework is double at weekend. 在周末作业是双倍的用法】作形容词， 意为“双倍的、两倍的、两用的”，在句中作定语或表语。
举例】①I think you will get double harvest. 我想你们会有双倍的收成②We’d like a double room. 我们想要一个双人间2. Maybe Brian and I can join you after supper. 晚饭后或许布莱恩和我会加入到你这里用法】动词join在这里表示“加入”，如果表示“加入到某人的某种活动中”可用句式join somebody in …举例】Lisa, can you join us in the game? 丽萨，你能和我们一起做游戏吗？3. Well, it’s worth a try, even if I don’t find a planet. 好的，这值得一试，即使我没有发现行星用法】even if意思是“即使、纵然”，引导让步状语从句，表示某种条件举例】He will come on time even if it rains. 即使下雨,他还是会准时来的拓展】在口语中，even if往往用在句首举例】Even if he is poor, he always looks happy. 即使他很穷，但看上去他总是很快乐。
Lesson 28: The Study of Living Things3I. Learning aims:Master the new words: Chip Taylor, biology, butterfly, migrate, fantastic, completely, grandchild, female, milkweed, chemical, puzzling II. Learning important and difficult points: 1) Fantastic facts about the butterfly have been drawing Dr. Taylor’s attention.2) Here, as many as 230 million butterflies spend the winter.3) But in Mexico, people cut down the trees that the butterflies need to rest on because they want more land for farming.4) This is both puzzling and interesting for many scientists.Language Points:1. fantastic【用法】作形容词，意为“奇异的、极好的、了不起的”，在句中作定语或表语。
举例】①I think this is a fantastic invention. 我想这是一个了不起的发明②These flowers are so fantastic. They have many different colours. 这种花太奇异了它们有很多不同的颜色2. chemical【用法】作可数名词，意为“化学物质、化学制品”，复数形式是chemicals举例】There are no chemicals in this kind of food. 这种食品中没有化学物质用法】作形容词，意为“化学的、化学作用的”，在句中作表语或定语举例】We can find chemical additives in many foods. 我们在很多食品中发现了化学添加剂3. Fantastic facts about the butterfly have been drawing Dr. Taylor’s attention. 这些有关蝴蝶的奇异的事实引起了泰勒先生的注意用法】句中的have been drawing 是现在完成进行时，它由“助动词 have (has) + been + 现在分词”构成，当主语是第三人称单数时用助动词has，其他情况用助动词have。
现在完成进行时主要表示从过去开始一直持续到现在的动作，这个动作是否延续下去，要根据上下文而定它往往与表示一段时间的时间状语连用，如：all the time, this month, all day, these few days, for a year, since a week ago等举例】①She has been playing basketball after school this week. 这个星期她放学后一直打篮球②Tony has been 。