高中生物 第7章 第2节 现代生物进化理论的主要内容课件 新人教版必修2 (91)

1、 说明文是以说明为主要表达方式，要求用简洁明了的语言来解说事物、阐明事理，从而给读者提供知识的一种文体。近几年高考说明文多数以图表、表格或文字的形式给出提示，并往往融合在应用文体中进行考查，一般分为：场所路线介绍；事物介绍；方式、方法或计划安排介绍三大类。写说明文宜采用三段式： 第一段：主要介绍要说明的对象及说明的目的； 第二段：说明事物的主要特征或做事情的方法步骤； 第三段：进行总结概括。时态通常用一般现在时。写作时应遵循以下几个步骤： （1）仔细审题，明确说明对象，抓住要说明的事物或事理的主要特征。 （2）选择合理的说明顺序（时间顺序、空间顺序或逻辑顺序）分层次进行说明，注意条理清晰。 （

2、3）选择恰当的说明方法，比如定义法、举例法、比较法和细节描述法等，不要遗漏主要内容。 （4）根据说明顺序及内容确定过渡词和恰当的句型结构。文字应客观、简洁、明了，不要追求华丽和加入太多个人观点。说明“方位”常用语：.is located at the foot of/by the side of., to the east of. In front of it is., with.on its left and.on its right.Turning to the left, you will see., behind which is.Walking past., the building

3、 that appears in front of you is.Along the road are lines of trees, from which students can findA walk around.is a feast for the mind as well as the eye.Opposite to the.stands.The door on your left leads you to. Next to the door against the wall there is a., On your left lies a., with all kinds of.i

4、n it.说明事物的“特点或优势”常用语：.is a new kind duced by., which is.Made of., it is light, small, and easy to carry. China is a large country with rich history and much population.It is rich in natural sources such as coal and gold and has mild weather. .is provided for the convenience of customers/visito

5、rs. Built in the 16th century, the castle has witnessed too much coming and going in history.说明做某事的 “具体方法”常用语：Nowadays it is common to use., but not knowing how to use.As is known to all, it is important to. With the development of., there is an increasing need for people to know how to.There are se

6、veral steps to follow./Here are some tips. The first thing to do is to.Although.is important, but without., all the efforts you have made will be in vain. To ensure success, there is one more thing that you must bear in mind, that is.If you can do what has been mentioned above, you can guarantee suc

7、cess. With the help of the above methods, you will achieve your goal soon. 根据以下图画，写一篇英语短文，描述今昔通讯方式的变化，以及这些变化给人们生活带来的影响。注意：不少于120词；文章开头已给出， 不计入总词数。 Great changes have taken place in the way people communicate with each other from a long distance. In the past， people wrote letters to exchange informat

8、ion with each other. Later on， they could talk with each other on the fixed telephone. Now more and more people use their own mobile phones to communicate and instead of writing on the paper they e-mail to each other on the computer. With the help of the 3G technology， some even can talk face to fac

9、e. As a result，people find it quicker and easier to communicate， but at the same time some people feel that they become poorer in writing， and the relationship between each other becomes not so close as before.行文逻辑：时间位移的对比In the pastLater onNow；连接词的变化As a result，but，and等。词汇短语：take place；communicate

10、with；in the past；exchange with；instead of；e-mail to；with the help of；talk face to face；as a result；at the same time等。句式句法：定语从句in the way people communicate with.；比较结构more and more people./people find it quicker and easier to communicate./they become poorer in writing.等。假设你是李明，你发现部分同学每次遇到重要考试，都会出现一些焦

11、虑症状。请你用英语写一封信，向某学生英文报编辑反映该问题。信的内容应包括下列要点： 焦虑症状焦虑症状 建议建议 其他建议其他建议（考生自己拟定）（考生自己拟定）头晕、乏力、睡眠不好、食欲不振等1.考前制定好合适的复习计划12.考试期间正常作息23.睡前洗热水澡、喝热牛奶等有助于睡眠注意：1.根据以上内容写一篇短文，不要逐句翻译，可适当增加细节以使行文连贯;2.词数：120词左右；开头已给出，不计入总词数;3.参考词汇：头晕dizzy(adj.)。Dear editor,Im Li Ming of Senior Three, Guangming Middle School. Im writing

12、 to tell you about some symptoms of anxiety among us students before exams. Dear editor, I am Li Ming of Senior Three, Guangming Middle School. I am writing to tell you about some symptoms of anxiety among us students before exams. Most of us feel nervous whenever were taking an important exam. Some

13、 will feel dizzy or tired, some will suffer from lack of sleep, and some will lose their appetite. In fact, all these symptoms have terrible effects on our exams and we are all eager to get rid of them。 First of all, in my opinion, its important for us to have an appropriate attitude towards exams.

14、They are only a means of checking how we are getting along with our studies, so there is no need to worry too much about the results. Study hard every day and make careful plans for every exam. In this way we can avoid suffering from the pressure of exams. Besides, enough sleep can make us energetic and enable us to perform well in an exam. Therefore, we should not stay up too late. We can also try a warm