1. remain高频考查词汇高考命题一般考查它作系动词的用法,2007年山东卷就考查了remain seated表状态的用法,2009四川卷、山东卷又对这一考点进行了考查,2010届考生仍应该注意remain系动词用法,remain和stay的区别,用作系动词时,意思为“保持某种状态”,后常跟形容词作表语。作实义动词时,stay和remain均表示“留下”,但表“剩下”之意时,只能用remain,不能用stay
第二节(共15小题,每小题1.5分,满分22.5分)
听下面5段对话或独白,每段对话或独白后有几个小题,从题中所给的A、B、C三个选项中选出最佳选项。每段对话或独白听两遍。
听第6段材料,回答6-7题。
6. What is the woman looking for?
A. A shelf. B.A light. C.A piece of metal.
7. What will the price be next week?
A.$30. B.$126. C.$152.
听第7段材料,回答8-9题。
8. How many hours is the store open on Wednesday?
A.Nine hours. B.Nine and a half hours. C.Ten hours.
9. How much would you pay for this store's main product on Saturday if it cost $100 during the rest of the week?
A.$92. B.$82. C.$88.
听第8段材料,回答10-12题。
10. How long does the woman's son stay at school every day?
A.Less than 12 hours. B.More than 12 hours. C.Only 12 hours.
11. How does the woman's son usually go to school?
A.By Car. B.By bus. C.On foot.
12. Where does the conversation most probably take place?
A.At school. B.In the office. C.In the street.
听第9段材料,回答13-16题。
13. Why did Mr John's chickens hardly lay any eggs?
A. Because it was winter. B. Because it was very noisy. C. Because it was very hot.
14. What could Mr John do if he wanted to earn more money?
A. To lower the temperature of his chicken-house.
B. To buy more and more chickens from the market.
C. To put more air and food into his chicken-house.
15. Why was Mr John not interested in the owner's suggestion?
A. Because it was quite cool in his own house.
B. Because his wife couldn't sell any eggs for him.
C. Because he only thought of how to make hens lay more eggs.
16. Which of the following expresses the main idea of the passage?
A. Mr John was a rich farmer who raised chickens.
B. Mr John only wanted to earn more money for himself.
C. The owner of the company only wanted to sell his products.
听第10段材料,回答17-20题。
17. What is the passage mainly about?
A. The development of air masses.
B. Some reasons why the temperature of the air is always changing.
C. The colour of the clouds during the day or night.
18. In which direction do the air masses move with cold air?
A. East. B. South. C. North.
19. What may affect the temperaturechanges?
A. The quantity of clouds in the sky. B. The height of clouds in the sky.
C. The temperature of the clouds.
20. What happens to the temperature when there are many clouds during the night?.
A. The temperature rises much on. B. The clouds keep up the temperature.
C. The clouds keep the air temperature from dropping much.
2、指数函数的性质
备课说明:先从宏观上引导学生思考研究函数的方法及思路,先后通过学生具体的操作,探究出指数函数的性质,在教学中注意数学思想方法及数学思维方法的渗透,特别是数形结合及归纳法的应用,使学生形成科学的思维方法和探究思路,培养学生探究能力及概括能力。
例1. (书本P57)函数()的图象经过点(3,),求,,的值.
问题九:确定指数函数重要要素是什么?
待定系数法
例2. 比较下列各组中两个值的大小:
(1), (2), (3),
问题十:观察这三组数有什么区别?
问题十一:对于同底的两个数比大小,应用指数函数的哪个性质去解决?
单调法:构造函数,利用单调性
问题十一:对于同底的两个数比大小,应用指数函数的哪个性质去解决?
搭桥比较法:用特殊值1
设计说明:本题是为了让学生用抽象的函数性质来解决实际的数学问题,培养学生的抽象思维能力
五:课堂小结:
1、问题十三:今天我们共同体验了研究一个新函数的方法,也就是???
(1) 给出函数定义;(2)作出函数图象;(3)研究函数性质;(4)解决简单问题
4、根据图象归纳:指数函数的性质 (书P62)
3、几何画板演示多个的图象
问题七:指数函数的图像有什么特点?
问题八:通过图象,你能”读出“我们想要研究的这些性质吗?
2、课堂练习:学生练习作图:y=3x,y= [实物投影]
问题四:指数函数是我们在学习了函数基本概念和性质之后的接触到的第一个具体函数,而且我们已经得到了它的解析式,那还应该去探索它的哪些性质呢?
研究内容:定义域、值域、对应法则,特殊点、单调性、最大(小)值、奇偶性.
问题五:用什么方法去研究它的这些性质呢?
研究的步骤:1、先给出函数的定义;2、作出函数图象;3、结合图象,研究函数性质:
问题六:怎样才能得到指数函数的图象?
1、PP演示在同一坐标系中画出下列函数图象: ,
2、函数 y = (a2 - 3a + 3) ax 是指数函数,求 a的值.
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