【金榜课件】届英语浙江人教课件：选修unitglobalwarming.ppt

【助记】 6. average adj. 平均的；普通的 n. 平均; 平均数 the/an average of. . . ……的平均数 on average 平均地；通常 above/below average 高于/低于平均数/水平 up to average 达到平均数 ①Parents spend an average of $200 a year on toys for their children. 父母给孩子买玩具的花费每年平均为200美元。 ②The average man is not interested in this subject. 普通人一般对这个题目不感兴趣。 ③The average of 4 and 8 is 6. 4和8的平均数为6。 ④Two students are absent each day ___ ________. 平均每天有两个学生缺席。 on average 【真题链接】 ［2010江西，35］Last year the number of students who graduated with a driving licence reached 200, 000, a (n) ______ of 40, 000 per year. A. average B. number C. amount D. quantity 【解析】选A。句意：去年毕业时已获得驾照的学生达到了20万人，平均每年4万人。a number of 许多, an amount of 一般加不可数名词表数额, a quantity of 既可以加可数名词也可以加不可数名词, 但没有平均每年增加的意思。 7. circumstance n. 环境；情况 in/under the circumstances 在此种情况下 in/under no circumstances 决不，无论如何都不 ①In/Under the circumstances he felt unable to accept the job. 在这种情况下，他觉得无法接受这项工作。 ②Circumstances permitting, I’ll go abroad to study. 情况允许的话，我会出国学习。 【点津】 circumstance意为“环境，情况”时，多用复数形式。 in/under no circumstances置于句首时引起部分倒装 ③A baby shouldn’t be left alone in the house in any circumstances. (句型转换) =In no circumstances ______ __ _____ __ ___ alone in the house. should a baby be left 8. come about 发生；造成 ① I’ll never understand how it came about that you made such a mistake. 我真不明白你居然犯了这么个错误。 ② How did these differences come about? 这些差别是怎样产生的？ 【辨析】理解下列区别并选词填空 come about happen 发生，产生，指要求解释或说明事情发生的理由 发生，常用词汇，指偶然的，意外的，具体客观事物的发生或出现，尤其指自发的未能预见的事情的发生 take place break out occur 发生，指事件或事故的发生是在预料中的并非是偶然的，进而引申为按计划“进行，举行” 指战争、火灾、地震、疾病等的突然“发生、爆发” 多指意想不到的事情的发生，用作此意时一般不和happen换用 ③Luckily the earthquake didn’t ____________ in the center of the city. ④Great changes have ___________ in our school in the past few years. ⑤A fire _________ during the night. ⑥Argument occasionally ______________ between them. ⑦How did it __________ that they knew where we were? happen/occur taken place broke out occurs/ha