Step 1 Review 第一步 复习 (展示上节课的家庭作业.教师选几篇文章读给学生听.或者让学生自己读出自己的文章.) T: Everyone has written an article about teenagers’ lives. Would you like to read yours for us? (学生举手或老师挑选学生来读.) You can also exchange your compositions to read after class. Kangkang’s granny has told him a true story about herself. She was a child laborer when she was a young girl. She had little food to eat. She often went hungry. go hungry Though she was hungry, she had to grow cotton. Because her job was to grow cotton. Her job was to do sth. / grow cotton What’s our job? Our students'jobs is to study hard now. In the future we can make our country more beautiful and stronger. Kangkang’s granny had to divide her money into two parts to help support her family and helps send her elder brother to school. divide... into... elder brother Your lives are much better. Read 1a on Page 5. Underline the new words and useful expressions according to the words on the blackboard. (教师板书以下问题或放投影.) 1.What kind of place did the granny live in? 2.How were the living conditions? 3.What was the granny's job? 4.How did the boss treat the child laborers? 5.What was the money used to do? T: Listen to the text first. And then discuss the answers to the questions with your partners. (让学生先自读.再小组讨论问题的答案.) T: Can you get the answers? Let’s discuss them together. T: What kind of place did Kangkang’s granny live in? S1: A large room. T: What else? A large room is very comfortable for living, isn’t it? S2: No, it isn’t. She lived with many other child laborers. S3: There were some cows there, too. T: So she had a hard living condition, didn’t she? Ss: Yes, she did. T: Who can give us a full answer? S4: She lived in a large room with some cows. T: Sure. What a bright/clever boy/girl! (板书第一题答案中的关键词.) 1. a large room, cows T: How were the living conditions? What was the granny’s room like? S5: It was broken. S6: When it rained outside, the rain would come in. 2. rain outside, come in T: What’s granny’s job? S7: To grow cotton. S8: Her job was to grow cotton. 3.grow cotton T: How did the boss treat the child laborers? S9: The boss was very cruel. S10: He also shouted at them. T: Did he hit them? S11: Yes. He was so cruel that he didn’t give them enough food. Also he shouted at them and hit them. T: If the children fell ill. What would the boss do? S12: He would become very angry. T: So we can say how cruelly the boss treated the child laborers. 4.didn’t give enough food, shout, hit, ill, angry T: Kangkang’s granny could get a little money. What was the money used to do? S13: It was divided into two parts. One part was used to help her family, and the other to help her elder brother. 5.divide into two parts, family, elder brother (教师指着黑板上板书内容让学生集体复述本故事.学生若说不全老师可补充.) For example: The granny lived in a large room with many other child laborers and cows. When it rained outside, the rain came in. Her job was to grow cotton. The boss didn’t give them enough food. He shouted at them and hit them. He became angry when they were ill. Her money was divided into two parts to help her family and her elder brother. Step 2 Presentation 第二步 呈现 (教师向学生展示一张现代舒适生活的照片或人们的住房图片.引出新内容.) (也可用投影片或多媒体展示.) T: Kangkang’s granny had a hard childhood. She couldn’t go to school. She had to work to help her family and she didn’t have any comfortable living conditions. But now, please look at the picture. Ss: Wow! (学生看到如此好的住房可能会发出感叹.在脑海里他们会与童工的住处做比较.) T: Our country has made rapid progress in recent years. make progress, rapid, recent (教师用英语讲解make progress.) T: The things get better and better in recent years. T: Our country has become stronger and stronger. The economy has developed a lot. (向学生展示有立交桥.环形路.高楼大厦的图片或农村新村图.) Ss: How beautiful! There are so many cars and buildings. T: Please listen to the report written by Michael. And complete the sentences. (板书或大屏幕投影以下几个句子.) 1.Twenty years ago, the buildings were and ,and there many ring roads. 2.People's living conditions weren't . 3.But China has rapidly in recent years. 4.The new buildings are and . 5.More and more+ have appeared. 6.People's living conditions have a lot. (播放录音.学生听录音完成句子.了解北京的新变化.) T: Now, please open your books to read 2a on Page 6. Read and understand the report by yourselves. Could you please check the answers? (学生读过一遍课文.完成此项作业.) T: Please read the report aloud. (让学生读课文.为下一步讨论作语言上的准备.) T: Great changes have taken place in Beijing. The buildings used to be small and dark. We haven’t seen any ring roads. People’s living conditions weren’t comfortable. What has happened to Beijing’s roads now? What has happened to...? Ss: There are more and more ring roads in Beijing. (如答不出.教师可把答案说出.引导学生回答第二个问题.) T: We have seen more and more ring roads in Beijing. What has happened to the living conditions in Beijing? (引导学生根据课文内容回答此问题.) Ss: People’s living conditions in Beijing have improved a lot. T: Many people, even the old people, are learning English now. Who can tell us the reason? Ss: Beijing will host the 2008 Olympic Games. (或The 2008 Olympic Games will be hosted in Beijing.) T: I think the people will be more friendly and helpful in 2008. Though China has made such rapid progress, it’s important to remember the past. Step 3 Consolidation 第三步 巩固 (向学生展示教材2b的四幅图画.可采用教材中的图.也可制作幻灯片.多媒体.) T: Look at the pictures and talk about them with your partners. Work in pairs. (教师可出示下列问句帮助学生完成对话.) 1. What were Beijing’s roads like in the past? 2. What has happened to Beijing’s roads now? 3. What will Beijing’s roads be like in the future? (若此部分学生不好操作.也可再让学生读2a的文章.) (学生自由对话谈论北京的各种变化.尤其是道路.住房.城市环境及人们的变化等各方面.) (请两位学生到前面用英语谈论北京的过去.现在和将来.) T: S1 and S2 are talking sth. about Beijing. Let’s listen to what they are talking about. For example: S1: Which city do you like best? S2: Beijing, I think. There were so many small and dark buildings in the past. But there are many beautiful, big buildings now. They are very modern. What about you? S1: I want to drive a car in the future. There are many wide roads in Beijing. I like Beijing very much. (引导学生谈论北京各个方向的变化.让学生感受这个世界越来越美好.) Step 4 Practice 第四步 练习 (将话题引入到学生的实际生活.让他们分组讨论.一人汇总讨论结果.另选一人向全班汇报结果.) T: Do you like your own city/ hometown/ school/ house? I’m sure you love her very much. What was she like in the past? What has happened to her now? What will she be like in the future? T: Work in groups. Discuss these questions with your partners. And one of you will give a talk in front of the class. For example: When my parents were very young, our city was a small town. There was only a small shop and a main road. There were no big buildings. I have seen the changes in my city. She has made rapid progress. There are many supermarkets here, ring roads and so on. I have a big house to live in. It’s very comfortable. My ideal city will be more beautiful and cleaner. Flowers and trees will be here and there. (双人小组活动.教师分别给每组学生分发两张对比强烈的照片.让学生看图片进行对话或作文.) T: Compare the two pictures and say something about them. Work in pairs, please. Begin! (两个学生手中拿的图片不一样.) For example: S1: The road in Picture A is narrow. Perhaps it was built twenty years ago. S2: Here’s a wide road in Picture B. Do you like it? S1: I like the roads which are wide. / I like wide roads. (学生两人一组讨论图画的内容.感受世界的变化.) (教师可选几组同学让他们在全班同学面前表演.) T: Show your pictures to the class and say something about them. For example, its roads, living conditions... (学生尽力将图画中的内容说出.说的越多越好.在学生说的过程中.教师进行适时引导.让他们感受世界的可爱与美丽.) T: In a word, our world will be more beautiful and the people will be more friendly and healthier. The rapid progress can be made because of thousands of people’s hard work including your grandparents and parents. We have happy lives at present. We are all happy. We have different kinds of food to eat, fashion clothes to wear. It’s the most important for us that we can get a chance to go to school. We can get a good education. Step 5 Project 第五步 综合探究活动 1.T: If you want to know more stories about the old days, you may ask your parents or grandparents after school. Now, if you have known another story about your grandparents or parents childhood, please tell us. (如果恰巧有学生有故事要讲.此时应欢迎他站起来讲.如果教师有这方面的故事.也可以把家人的旧照片拿到课堂上来.模仿中央电视台的栏目进行介绍.) (教师还可以讲讲雷锋的故事.) For example: Lei Feng had lost his parents when he was very young. He had to work for the lord day and night. He went hungry just like Kangkang’s granny. When he was older, he became a soldier of PLA. He loved helping others. It’s very popular to learn from Lei Feng among us. 查看更多

 

题目列表(包括答案和解析)

(10分)植物具有向重力生长的特性,下列是研究根向重力生长机理的两个实验。
实验一:将空白琼脂和含EDTA的琼脂做成帽状,分别套在甲、乙两组玉米胚根的根冠外(示意图如下)。提示:EDTA的作用是去除与其临接部位的 Ca2+

将胚根水平放置培养一定时间后,观察到甲组胚根向重力(下)生长,乙组胚根水平生长。根据上述实验结果,得出实验结论:                               
  实验二:水平放置的胚根弯曲向下生长,与根冠近地侧的Ca2+浓度明显高于远地侧有关。研究表明,根总是朝着Ca 2+浓度高的方向弯曲生长。为验证这一结论,有人设计了下列实验方案。请根据提供的实验材料和用具,写出第二步及以后的实验步骤和实验结果,并回答问题。
(1)实验材料和用具:胚根等长的萌发玉米种子,空白琼脂帽,含EDTA的琼脂帽,上面部分含Ca2+的琼脂帽(水平方向),培养皿等。
(2)实验步骤:
  第一步:取若干个培养皿,在每个培养皿中放置适量的萌发玉米种子,按实验一中乙组的方法处理胚根一定时间后,移去根冠外的琼脂帽。然后将培养皿平均分成两组,编号为 A组、B 组。 
  第二步:                                                            
  第三步:                                                            
(3)实验结果:                                                         
(4)科学家进一步证实,根冠中生长素的分布受Ca2+浓度影响,当胚根水平放置时,重力诱导Ca2+向根冠下侧移动,导致近地侧的生长素浓度比远地侧高。请分析胚根的生长素分布与向重力生长的关系:                                  

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如图甲表示某生物膜结构,图中A、B、C、D、E、F表示某些物质,a、b、c、d表示物质跨膜运输方式。图乙和图丙表示物质运输曲线,请据图回答:


(1)若图甲是癌细胞的细胞膜,则膜上含量较正常细胞减少的物质是[  ]    
(2)若图甲是线粒体膜,b和c过程运输的气体分别是    。b、c运输方式符合图    所表示的物质运输曲线。
(3)若图甲表示人体红细胞膜,则表示Na、K运输的分别是图中      。Na、K的运输方式符合图    所示曲线。
(4)已知红细胞吸收葡萄糖是协助扩散,而有人认为小肠上皮细胞以主动运输的方式吸收葡萄糖,请设计实验加以确定。
①实验步骤:
第一步:取甲、乙两组生理状况相同的小肠上皮细胞,放入适宜浓度的含有葡萄糖的培养液中。
第二步:甲组细胞给予正常的呼吸条件,         
第三步:                
②预测实验结果并分析:
a.若甲、乙两组细胞对葡萄糖的吸收速率基本相同,则         
b.                                

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阅读下面文章,完成小题。(13分)
用善良做底色
松 韵
天气冷得出奇,寒风咆哮着卷起雪花,升腾起呛人的白烟。
温暖的红砖房里,母亲在厨房里忙碌着,柴火在灶坑里噼啪作响,锅上冒着润白的蒸气。我和弟弟早就饿了,正眼巴巴地等待着第一锅酸菜肉蒸饺出笼。
这时,有人叫门。父亲出去片刻,带回一个衣着单薄的外乡人来。看上去是个20多岁的农民,但是很年轻,嘴唇都发青了,显然在风雪中冻了很久。
“这丝棉很好的,你看看。”他说着,卸下肩上的旧麻袋,就要往外掏丝棉。
“别拿了,我不买丝棉。”父亲止住了他,“外面太冷,请你进屋暖和暖和!”“哦,不买?不买啊?这丝棉好,真的很好。”他有些失望,坐在暖和的火墙旁,一时却也并不想挪动。
这时,母亲端上了两大盘热腾腾的酸菜肉蒸饺。“你一定饿了,吃几个饺子挡挡寒吧!”母亲看着仍有些哆嗦的他,把筷子递过去。  
那人的确是饿了,推辞了一下,便接过筷子狼吞虎咽起来。当他意识到我们一家人还没吃饭时,两盘蒸饺只剩下了小半盘。他尴尬地抬起来,窘迫不安地嗫嚅道:“这……我……我……你们,你们还没吃吧?”
母亲笑道:“还有呢,你要吃饱了啊!”
蒸饺的确还有,可那一笼是纯素馅儿的,一丁点儿肉都没放。
弟弟捏了捏我的衣角,嘟起嘴来。
一盘半的蒸饺,对他来说可能也就六分饱,但无论如何他也不肯再吃了。
接下来的聊天中,我们知道他是安徽的农民,跟父亲弟弟一起到北方贩丝棉,没想到折了本,近年关了,打算把剩下的丝棉低价处理了,好歹挣回返乡的路费。  “我兄弟的脚冻坏了,他跟我父亲在车站蹲着呢。今儿天太冷,没让他们出来,我寻思把最后一包丝棉卖了,今晚就跟他们坐火车回去。”他说。
母亲听了,感叹道:“唉,你们做点小生意,也挺不容易啊!”
父亲跟母亲轻声说了点什么,母亲便去仓房找了三双半新的棉鞋,还有半面袋的冻豆包回来,递给这个年轻人说:“我们也不是有钱人家,要不然,就把你这丝棉买下了。这双棉鞋你换上,另两双拿去给你父亲和弟弟穿,北方不比南方,脚冻伤了可了不得!冻豆包我们今年蒸得多,你带几个让你的父亲和弟弟尝尝吧!”
年轻人站了起来,拘谨地搓着手,一遍遍地说:“这可咋好呢?这可咋好呢?我这是遇上好人家了!”  
我们把他送出门时,年轻人一眼瞥见院子里一堆锯好的圆木。他突然放下肩上的包,三步两步抢过去,“我干点儿活再走!”说着便抡起大斧,劈起柴来。母亲正要劝阻,父亲说: “让他干吧!”
寒风中,雪花飘飞,年轻人已经走了,我家院子里,整整齐齐地码着一垛劈得粗细均匀的柴火。
弟弟吃了剩下的半盘有肉的蒸饺,玩去了。我跟父母吃着第二笼纯素馅儿的蒸饺,觉得温暖而香甜。
我一直认为,在这个世界上,最赏心悦目的,是纤尘未染的青山绿水;最温暖人心的,是人与人之间纯洁真挚的感情。 暮年回首时,最有价值的财富,应是一颗恬淡宁静的心,和一份丰富无悔的回忆。而所有这一切的拥有,都需要用一颗善良单纯的心做底色。
【小题1】文章开头第一段的环境描写有何作用?(3分)
【小题2】“我”和父母吃着纯素馅蒸饺时,为什么会觉得“温暖而香甜”?(3分)
【小题3】年轻人在作出为“我”家劈柴的决定时,心理活动是怎样的?请联系上下文,
用文字写出来。(2分)
【小题4】年轻人在为“我”家劈柴时,母亲要阻止,而父亲却说“让他干吧”, 父亲这样做
的原因是什么呢?(2分)
【小题5】读下面的材料,然后结合本文,说说你的感受。(3分)
联合国秘书长安南卸任后,在得克萨斯州的一个庄园里举行了一场慈善晚宴,旨在为非洲贫困儿童募捐,应邀参加晚宴的都是富商和社会名流。当天慈善晚宴的主角不是倡议者的安南,不是捐出300万美元的巴菲特,而是仅仅捐出30美元零25美分的小露西。她说了这样一句话:“慈善的不是钱,是心。”让全场的人感动不已。

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阅读短文,在其后空白处写出各单词的正确形式。单词的第一个字母已经给出。

    The worst traveler in the world was Paul of San Francisco. Once he f____1. from the U.S. to his hometown in Italy to see someone at home. The plane made a one-hour stop to get oil at an airport in New York. Paul thought he was in Rome. C____2., he got off the plane.

    When nobody was there to meet him, Paul thought maybe the heavy t____3. made his friends late. While looking for their address, Paul found that the old “Rome”had changed a lot. He found many high m____4. buildings instead of old ones. He also found that many people spoke English but not Italian and that many street signs were w____ 5. in English.

    Paul knew very l____6. English. So he asked a policeman in Italian the way to the bus station. He happened to meet a policeman who was also born in Italy and answered in the same l____7..

    After twelve hours’ traveling round on a bus, the driver handed him over to a____8. policeman. But this time, this policeman could only speak English. So paul asked the policeman why the Rome police employed(雇佣)so many people who spoke English as policemen.

    Paul didn’t b____9. he was in New York when he was told so. To get him on a plane to Italy, he was s____10. to the airport in a police car.

 

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根据情景补全对话?

A;1     you 2     to 3     to the cinema??

B: That's a great 4    !5     go 6     Lingling.7     is it??

A: It's 8     the afternoon and 9     the evening.?

B: 10      go in the evening.11      you 12      to 13      to a football 14     on Sunday? It's Manchester United, my 15     team.?

A: That's a good 16    .

 

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同步练习册答案