1、Lesson 26: Keep the Candle BurningI. 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 d
2、oes 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
3、，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
