Unit4Globalwarming4-3LearningaboutLanguage课件（人教版选修6）.ppt

Ⅰ.词汇 1．The ________ (平均的)age of the boys here is ten. 2．She has a ________ (倾向) to make over her ideas to match his. 3．Has anybody ever seen any beings from ________ (外部的) space? 4．The result is the ________ (存在) of a gap between expectations and realities. 5．Systems which may find ________ (普遍的)use in the future are also discussed.;答案：1.average　2.tendency　3.outer　4.existence　5.widespread ;Ⅱ.短语 1．重视，强调________ 2．有做某事的倾向________ 3．产生；成立________ 4．平均________ 5．大体上；基本上________ 答案：1.put/place emphasis on　2.have a tendency to do e into existence　4.on the/an average　5.on the whole; average 1)adj. (1)平均的 The average age of the boys in this class is fifteen. 这个班级中男生的平均年龄为十五岁。 (2)典型的；正常的 40 hours is a fairly average working week for most people. 对大多数人来说，一周工作40小时是相当正常的。;(3)普通的；平常的；一般的 It was an average piece of work. 那是一件普通的产品。 2)n. [CU] (1)平均数 The average of 4, 6 and 8 is 6. 4,6,8的平均数是6。 (2)平均水平；一般水准 The amount of snow this year has been below average. 今年的降雪量低于平均水平。;【知识拓展】 on(the/an)average 平均； 一般而言 ①We made a loss today, but on average we make a profit. 今天结算亏损，但是平均起来，我们还是赚钱。 ②He is weak at English, but on average his marks are not bad. 他的英语虽差，但平均成绩不差。;【词语辨析】 average, regular, normal, ordinary, natural 1)average通常用来形容优劣难分的平庸或折衷情况，也指理论上的平均标准。 The average temperature in Oxford last month was 18C. 牛津上月的平均气温是18C. 2)regular指已有模式、有规律或定期的。 I wish my working hours were more regular. 我的工作时间能更正常一些就好了。;3)normal指不超过某种限度、符合某种标准或常规。 The doctor said the childs temperature was normal. 医生说孩子体温正常。 4)ordinary强调一般性和普通性，含不突出的意味。 On ordinary days I get up at eight oclock, but on my birthday I was up early. 平时我八点起床，但是我在生日那天起得早。 5)natural侧重某人或某物的行为符合其固有特性。 It is natural that such a hardworking student should pass the exam. 这么用功的学生考试及格是很自然的事。;【知识运用】 (1)(2010江西－35) Last year the number of students who graduated with a driving license reached 200,000, a (n) ________ of 40,000 per year. A. average　　　　 B. number C. amount D. quantity 答案：A　本题题意：持有驾驶执照的毕业生，去年的数量达到了20万，年均4万。averag