作出三角函数线，如图2-17

MP=sinθ，OM=cosθ，BS=ctgθ

通过观察和度量得MP＜OM＜BS

从而有sinθ＜cosθ＜ctgθ

∴应选A

∴cosθ＞sinθ

从而可剔除B、D．

再由sinθ＜ctgθ，故可剔除C

故选A

故选A．

每次写作前问自己四个问题：这篇文章的体裁格式是怎样的？主体时态用什么时态？人称用第几人称？可以分几段，之间用什么过渡词、连接词？带着这四个问题去审题，搞清楚文章的主要内容，然后列出提纲。最后丰富自己的提纲就可以了。

第四份资料

单项选择[1] 第一节　单项填空(共15小题；每小题1分，满分15分) 从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。 21.-Do you know Uncle Tom is crazy about gardening? 　 　 -Sure. He ____ his flowers in the garden now. A. may be watering　 　 B. must be watering C. could look after　 　D. ought to watch 22.____ the temperature falling so rapidly, we couldn't go on with the experience. A. Since　 　B. With　 　 C. As　 　 D. For 23. I'd love ___ to your party last Sunday if not because of the unexpected guests. A. to go　 　B. going　 　 C. having gone　 　D.to have gone 24. -Will you two go to the show tomorrow? -No. We're going to a lecture, or at least I'm planning ____. A. it　B. to　 　C. that　 　D. so 25. The rescue team ______to help but failed to get there in time. A. had wanted　B. have planned C. were expecting　D. hoped 26.1 haven't got a single ______from Aunt Mary since I last saw her. A. advice　B. news　C. message　D. information 27.-Is it Pro. King that will give the lecture on radiation? -I can't __ I know it for sure. A. say　 　 B. tell　 　C. speak　 　　D. talk 28. "No, no ", he whispered,____ talking to himself. A. while　 　B. even if　 　 C. as if　 　 D. when 29. - Any phone call for me? -Yes.____ telephoned 10 minutes ago. A. A Doctor Simpson　 　B. The certain doctor C. The Tim Smith　 　 D. A Simpson Doctor 30. ____ is mentioned above, the number of the cattle here has been limited to 200. A. It　B. Which　 　 C. That　 　 D. As 31. -Would you please give him the paper the moment he ____? -No problem. A. arrives　 　 B. appearing　C. came　 　D. reaches 32.I wonder ____ we can solve this hard problem. A. what else　 　B. how else　C. that　 　 D. as if 33.- Excuse me, can you tell me the way to the bank? -Oh, that's ____, it's either the second or the third road on the left. A. the difficult one　 　B. a hard one C. an easy one　 　D. the very one 34. The newly-founded company is faced with lots of trouble, ____ the financial problem ia not the worst. A. which　B. of which　C. to whom　 　D. with which 35. To his surprise, his new play well ____ by the public in China, met a cold welcome abroad. A. received　 　B. accepted　 　C. accepting D. receiving

单项选择[2] 第一节　单项填空(共15小题；每小题1分，满分15分) 从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。 21.- ____ at the new school? -Fine, I've got used to the life there and I've made some friends. A. How are you　B. How are you doing C. Are you getting on well　D. How do you do 22. -Mary has a very low opinion of George. -It can' t be any worse than ____ of her. A. he　B. his　 　 C. him　 　 D. he does 23. I'll be home late, but please don't stay ____ for me. A. up　 　 B. in　 　 C. over　 　 　D. on 24.- What are you going to do next? -To write a science story about outer space ___ by Science and Technology Press. A. published　 　　B. being published C. to be published　 　 D. publishing 25. -How do you like the film? -There was nothing special--- it was only ____. A. average　 　　B. usual　 　 C. normal　 　D. common 26. In salad bars the waiter does not bring you salad. You have to____ yourself, usually to as much as you want. A. bring　 　B. serve　C. help D. supply 27. Our TV sets sell well, but ten years ago no one could have imagined such a big share in the market that they ____. A. were having　 　B. had had　 　C. were to have　D. had 28. Let us suppose that you are in____ position of____ parent. Would you allow your child to do such a thing? A. a; a　 　 B. a; the　 　C. the; a　 　D. the; the 29.- He has to finish the experiment today. He must be in the lab,____? -That s quite possible. A. mustn't he　B. won't he　C. doesn't he　 　D. isn't he 30. However, at times this balance in nature is disturbed, ____ a number of possibly unforeseen effects. A. lying in　 　 B. calling in C. taking in　D. resulting in 31. I wrote to my parents once a week,____ I was too busy with my teaching work. A. it　B. unless　 　C. when　 　 D. as 32. -Where will you start your work after graduation? -Mmm, it's not been decided yet. I ____ continue my study for a higher degree. A. need　 　B. must　 　C. would　 　 D. might 33. The truth, Sir, is that the old man____ across the street when my car hit him. A. was to walk B. had been walkingC. walked D. was walking 34. So many uses have been discovered for this wood ____ the supply of white pine is becoming smaller and smaller. A. then B. what　 　 C. that　 　D. which 35.-You seemed to have been impressed by his songs. -Well, not exactly so. It was his way of singing____ his voice that really impressed me. A. rather than　B. as well as　 　C. but also D. together with

单项选择[3] 第一节　单项填空(共15小题；每小题1分，满分15分) 从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。 21. I smoke out of ____ habit, not for ____ pleasure; for I have been in the habit for twenty years. A. a; the　 　B. the; a　 　C. x; the　 　D. x; x 22. His job is to sell the ____ carvings in the ____ department of the company. A. wooden; sales　 　 B. wood; sales　 　 　 C. wood; sale　 　 　　D. wooden; sale 23. My father ____ my brother for driving but he wanted to pick ____ the knowledge of the computer during his spare time. A. advised; up　 　　B.persuaded; out　 　 　　C.intended; up　 　 　D.managed; out 24. -Whose advice do you think I should take? -_______. A.You speak　B.That's itC.It's up to you　D.You got it 25. ____ the youth ____ the rising sun at 8 or 9 o'clock am, Mao Zedong expressed his great hope for the young men. A. Comparing; withB. Compared; to C. Compared; with D. Comparing; to 26. Not far from the club, there was a girden, ____ owner seated in it playing bridge with his children every afternoon. A. whose　B. its　C. which　D. that 27. I haven' t seen Mary these past few days. I m afraid she ____ herself for some time. A. isn't feeling　 　　B. hasn' t been feeling　 　 C. hadn't been feeling　 　 D. wasn't feeling 28. Doing your homework is a sure way to improve yor test scores, and this is especially true ____ it comes to classroom tests. A. before　B. since　 　 C. when　 　D. after 29. A love marriage, however, does not necessarily ____ much sharing of interests and responsibilities. A. take over　 　B. result in　 　C. hold on　 　 D. keep to 30. The teacher came to the classroom and demanded ____ what had happened. A. his students to tell him　 　 　B. being told C. telling him　 　 　D. to be told 31. There were many students and teachers at the party yesterday. I looked for two seats to sit down with my friend, Tim, but there were ____. A. neither　 　B. nothing　 　 C. none　 　 　D. no 32. It is in Steven Spielberg' s first film, Jaws, ____ a big white shark attacks swimmers ____ are spending their holidays in a small village by the sea. A. where; who　 　B. which; that　 　 C. that; that　D. where; that 33. -What do you think of the dinner in Mr Brown's? -Oh, great! We have never had a better one. It's a dinner of twenty ____. A. drinks　 　 B. people　 　C. tables　 　D. courses 34. The captain ordered the crew to throw ____ the side of the ship all heavy guns and even stores in order to raise the boat in the water. A. on　 　 B. through　 　 C. across　 　 　D. over 35. Knowing how long the test would last, the students who finished ____ back and waited until the end of the exam. A. settle　 　　B. settled　 　 C. settling　 　 D. to settle

单项选择[4] 第一节　单项填空(共15小题；每小题1分，满分15分) 从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。 21. What ______ public is concerned about is whether medical workers and scientists will be able to find for this new disease in a short time. A.不填;不填　B.不填;the　 　 C. the;不填　 　D.the;a 22._____ good, these cookies sell well. A.Smelled　 　 B. Smelling　C. Being smelled D. To smell 23.-Haven't I told you that I like the beef well done? -Yes, but I _____ it longer than I usually do. A. was cooking B.will cook　C. cooked D. had cooked 24. We' ve published large quantities of books. This year___ we've published three million. A. only　 　　B. just　 　 　C. alone　 　　D. merely 25. He ______. It's a shame my mobile phone was power-off. A. ought to call me　B. could have called me　 C. may be calling me　 　D.might call me 26.-Since you can't find a better job, why don't you stick to the present one? 　 　 -Well,_____. A.I believe not　 　　B.I don't care C. Never mind　 　 D. I might as well 27.The wedding party is to be held on May 18,_____ is, ten days_____ today. A. which; fromB.that;except C.that;from　D.as;since 28.You don't have to share the umbrellas. I'll give you one_____. A.every B.each　 　C.all　D.both 29.-Tom, keep your_____ on your studies. 　 　 - Sure, mum. I'll keep that in_____. A. mind;mind　B.heart;headC. brain; mind D.heart;brain 30.According to the Ministry of Health, by May 1, 2003, the total SARS deaths on the Chinese mainland_____to 170. A.has come　 　B. had reached　C.increased　 　D. had climbed 31. The door opened and in _____. A. he came　B. came he　C. did he come D. did Mr Smith come 32. After months of voyage, Columbus arrived in_____ later proved a new continent. A.where　B. what　C.which　 　 D.that 33._____ I toured Zhang Jiajie, I was deeply impressed with its beautiful scenery. A.For the fust time　 　B. At first　 　 C.It was the first time　 　 　D. The first time 34._____ private cars are bringing us convenience, they may also cause more traffic accidents and pollution. A.While　 　 B.As　 　 　C.If　 　 　 D.Since 35. Having ended the major combat (主战), President Bush_____ rebuilding Iraq. A. started out B. went all out　C. turned to　D. went on

单项选择[5] 第一节　单项填空(共15小题；每小题1分，满分15分) 从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。 21. ---Good morning. Grand Hotel. 　 　---Hello, I'd like to book a room for the nights of the 18th and 19th. A. What can I do for you?　B. Just a minute, please. C. What's the matter?　D. At your service. 22. You’d better choose someone______ you think ____ kind and friendly to help you. A. whom; to beB. who; is C. that; is　 　D. which; to be 23. Readers can __quite well without knowing the exact meaning of each word. A. get along B. get over C. get in　D. get through 24. The first textbooks written for teaching English as a foreign language ____ in the 16th century. A. came about　B. came out C. came along　D. came up 25. I shall always ____ your friendship greatly for friendship is more important than money. A. value B. pay high respect C. respect　 　D. store 26. Later they discovered, ____ was news to him, that Pamela was the headmaster’s daughter. A. that　 　 B. which　 　C. what　 　D. who 27. Was it in this very room ____ he made up his mind ____ he should break away from his family? A. that; which　B. which; that C. which; which D. that; that 28. Tim Bemers-Lee is generally considered ____ the World Wide Web, on which all the information is shared by all. A.to have founded B.having foundedC. founding D. to found 29. ____has been said before, it is not easy to learn a foreign language. A. As　 　B. It　 　　C. What　 　　D. As it 30. The employee must have been dismissed by the employer last month, ____ he? A. haven't　 　　B. hasn't　 　C. didn't　 　 D. wasn't 31.---I didn't go to work yesterday because my car broke down. 　---You ____ mine. I wasn't using it then. A. might borrow B. could have borrowed C. must have borrowed　 　 D. ought to borrow 32. I admired my classmate Lisa very much. ____ her prettiness, she was smart and helpful. A. Except for　B. But for　C. Apart from　D. In spite of 33. I haven’t seen her ____ the time ____ she had the accident. A. for; that　B. since; when　 　C. since; as　D. for; when 34. ---I'm going to Guilin next week. Do you have anything ____ there? 　---No, but thank you all the same. A. to be taken　B. to take　 　C. taking　 　　D. taken 35. The ____ is that the new machine will arrive tomorrow. A. chance　 　　B. luck　 　 　 C. happening　 　 D. accident

多使用过渡性词语。这样使文章更加连贯、更具有逻辑性。 (1)表示增加的过渡词：also，and，and then，too，in addition，furthermore，moreover，again，on top ofthat，another，first second third等。 (2)表示时间顺序的过渡词：now，then，before，after，afterwards，earlier，lat er，immediately，soon，next，in afew days，gradually，suddenly，finally等。(3)表示空间顺序的过渡词：near(to)，far(from)，in frontof，behind，beside，beyond，above，below，tothe right left，around，outside等。 (4)表示比较的过渡词：in thesameway，justlike，justas等。 (5)表示对照的过渡词：but，still，yet，however，on theotherhand，onthecon trary，in spite of，even though等。 (6)表示结 果 和 原 因 的 过 渡 词：because，since，so，as a result，therefore，then，thus，otherwise等。 (7)表示目的的过渡词：forthisreason，forthispurpose，so that等。 (8)表示强调的过渡词：in fact，indeed，surely，necessarily，certainly，withoutanydoubt，truly，torepeat，aboveall，mostimportant等。 (9)表示解释说明的过渡词：forexample，in fact，in thiscase，foractually等。 (10)表示总结的过渡词：finally，atlast，inconclusion，asIhaveshown，inoth erword，in brief，in short，in general，on the whole，ashasbeen stated等。

在作文中经常有一些好句子可以借鉴，为此，特总结如下，务必全部脱口而出。 1.According to a recent survey, four million people die each year from diseases linked to smoking. 依照最近的一项调查，每年有4，000，000人死于与吸烟有关的疾病。 2. The latest surveys show that quite a few children have unpleasant associations with homework.最近的调查显示相当多的孩子对家庭作业没什么好感。 3. No invention has received more praise and abuse than Internet. 没有一项发明像互联网一样同时受到如此多的赞扬和批评。 4. Many experts point out that physical exercise contributes directly to a person’s physical fitness. 许多专家指出体育锻炼直接有助于身体健康。 5.写信的开头：Very glad to receive your letter of July 13. 6.One day after school,XiaoMing passed a Caf on his way home. 7.The boss had no choice but to let him in. 8.How he enjoyed himself on the computer! 9.Walking home full of fear,he was sure that he would be scolded. 10.However,other students are against the idea. 11.Sometimes we have too many examinations which are too difficult for us. 12.today’s activity has taught us the new meaning of the spirit of LeiFeng:sharing with others what you have-you time,energy,or knowledge-makes you fell warm in you heart.It has truly a difference in how　I feel about myself. 13.The girl whose composition was well written is spoken highly of. 14.No matter what he says，I won’t believe. 15. Thanks to the good weather，our journey was comfortable. 16. At the news of his death，she went pale with sorrow.

(二)学习目标完成过程

　　 1：平抛物体的运动

　　 (1)简介平抛运动：

　　 a：将物体用一定的初速度沿水平方向抛出，不计空气阻力，物体只在重力作用下所做的运动，叫平抛运动。

　　 b：举例：用力打一下桌上的小球，使它以一定的水平初速度离开桌面，小球所做的就是平抛运动，并且我们看它做的是曲线运动。

　　 c：分析说明平抛运动为什么是曲线运动？(因为物体受到与速度方向成角度的重力作用)

　　 (2)巩固训练

　　 a：物体做平抛运动的条件是什么？

　　 b：举几个物体做平抛运动的实例

　　 (3)a：分析说明：做平抛运动的物体；在水平方向上由于不受力，将做匀速直线运动

　 　　　b：在竖直方向上物体的初速度为0，且只受到重力作用，物体做自由落体运动。

　　 　所以，平抛运动是一种曲线运动，它的水平分运动是　　 ，竖直分运动是　　 。

　　 2、平抛运动的规律

　　 (1)平抛运动的物体在任一时刻的位置坐标的求解。

a：以抛点为坐标原点，水平方向为x轴(正方向和初速度v的方向相同)，竖直方向为y轴，正方向向下，则物体在任意时刻t的位置坐标为　　　　　　　　　　　　　　　

　　 b：运用该公式我们就可以求得物体在任意时刻的坐标找到物体所在的位置，用平滑曲线把这些点连起来，就得到平抛运动的轨迹→抛物线。

　　 (2)平抛速度求解：

a：水平分速度　　　　　　

b：竖直分速度　　　　　　　　　　　

　c：t秒末的合速度

d：　 的方向　　　　　　　　

[课堂训练]

例1、飞机在高出地面0.81km的高度，以2.5×10²km/h速度水平飞行，为了使飞机上投下的的炸弹落在指定目标上，应该在与轰炸目标的水平距离为多远的地方投弹。

例2、如图所示，由A点以水平速度V₀抛出小球，落在倾角为　 的斜面上的B点时，速度方向与斜面垂直，不计空气阻力，则此时速度大小V_B=　　　 飞行时间t=　　　　　　　　　

例3、从高楼顶用30m/s的水平速度抛出一物体，落地时的速度为50m/s，求楼的高度。(取g=10m/s²)

例4、已知物体作平抛运动路径上有三个点，它们在以初速度方向为x轴正向，以竖直向下为y轴正向的直角坐标系中的坐标是：(3，5)，(4，11.25)，(5，20)，单位是(米)，求初速度 V₀和抛出点的坐标。

[课堂小结]

本节课我们学习了

　1、什么是平抛运动

　2、平抛运动是水平方向的匀速直线运动和竖直方向自由落体运动的合运动

3、平抛运动的规律　　　　　　　　　　　　

[板书设计]

[训练答案]

例题1、0.88km　

例题2、V₀ /sin　 、V₀/gtan

例题3、H=80m　

例题4、V₀=2m/s (1 .0)

(一)用投影片出示本节课的学习目标

知识与技能

1、知道什么是平抛及物体做平抛运动的条件。

2、知道平抛运动的特点。

3、理解平抛运动的基本规律。

过程与方法

通过平抛运动的研究方法的学习，使学生能够综合运用已学知识，来探究新问题的研究方法。

情感态度与价值观

通过平抛的理论推证和实验证明，渗透实践是检验真理的标准。

1、水平方向：　　　　　　　　　　　　　　　　 ；公式为：____________

2、竖直方向：　　　　　　　　　　　　　　　　 ；公式为：____________

(1)竖直方向上在连续相等时间内通过的位移之比为：

___________________________

(2)竖直方向上在相邻且相等的时间T内通过的位移之差　　　　　　

=_____________。

3、瞬时速度： V=______________　

4、V与V₀的夹角：tgq=______________

5、总位移： S=　　　　　 =　　　　　　　　　

6、物体运动到某一位置(X₀、Y₀)时的速度的反向延长线与X轴交点的坐标值为：_______________________________

7、物体运动到某一位置时，速度偏转角　 的正切值与此刻位移和X轴之间夹角　 正切值的比值为： ___________________

注意：已知V₀、V_y、V、x、y、S、q、t八个物理量中任意的两个，可以求出其它六个。

8、平抛运动是一种　　　　　　　　　 曲线运动。

[课堂实录]

引入新课

　 1992年11月15日 香港的“中国特技王”柯受良驾车飞越金山岭长城。(左图)

　 1997年，香港回归前夕，柯受良驾跑车成功飞越了黄河天堑壶口瀑布，宽度达55米，获得了“亚洲第一飞人”的称号。(右图)

新课讲解

14、倾角为θ的斜面，长为L，在顶端水平抛出一小球，小球刚好叠在斜面底端，那么，小球的初速度V₀为多大。

13、如图所示，小球自A点以某一初速做平抛运动，飞行一段时间后垂直打在斜面上的B点，已知A、B两点水平距离为8米，=30⁰，求A、B间的高度差。