练习册

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    我国师资力量缺乏.主要原因是教师工作辛苦.收入低.想当老师的人很少.所以需要大批有志青年献身教育事业 [范文] 我未来的打算 I decided to be a middle teacher after college. There are many reasons contribute to this decision. Firstly, when I was a little/boy, I have been dreaming of being a teacher. It seemed so fascinate to me and I hope I can make my dream come true. And, I like so much to be with middle school students. Most of the students at that age are full of youthful spirity and I am sure their passion would pass to me. I will retain all the zest of adolescence. The most important reason is that our country needs plenty of teachers. So far, teaching is considered a tough and low-income job in China. However, if we have not enough teachers, our future will lack of excellent scientist, managers, businessmen, soldiers and even goood workers and farmers. How can our country to be strong and wealthy? I wish my country to be a better one. I am ready to be a teacher and hope all the persons with lofty ideals may dedicate themselves to this meaningful career. 我的故乡 My native town is X. We have settled down here since my grandfather was a child. In other words, my family has lived here for more than one hundred years. It is a small village. there are about one thousand inhabitants. Most of them are farmers. The mode of their living is very simple. However, they have already possessed television sets and refrigerators. They made up their minds to live a modern life. 北京之旅 On July 5th my parents took me to Beijing. We stayed at Huabei Hotel. On the first day, we went to the Great Wall. The Great Wall is very long and old. It has millions of bricks. Each brick is very big and heavy. Lots of people from different countries like climbing the Great Wall. We felt very tired when we climbed to the top of the Great Wall. We also went to the Palace Museum. The Palace Museum has 9999 palaces. It has a very long history. I bought a lot of souvenirs of the Palace Museum. What nice palaces these are! I visited the Palace Museum and felt excited. If you want to know more about the Palace Museum, you can go to Beijing and have a look. The following days, we went to the Summer Palace, Tian Tan, North Lake and Xiang Hill. I now know more about the history of China. I also like modern Beijing. The 2008 Olympic Games will be held in Beijing. Later, I went back with my parents by train. I really enjoyed the trip to Beijing 体育运动的好处和坏处(Positive and Negative Aspects of Sports) a. 体育运动的好处 b. 体育运动可能带来的副作用 c. 我参加体育活动的体会 Sports do us good in many respects (TS). It goes without saying that taking exercises can build up our physical strength. In collective sports like basketball, volleyball, or football, we will learn the importance of cooperation. While taking part in sports game, we will try our best to win and arouse ourselves the competitive spirit. Sports can also help us relax after a period of exhausting work. However, as the saying goes, "there are two sides to everything", and sports is without exception. We may hurt other players or ourselves if we are not careful enough when participating in sports activities. What's more, excessive or severe training can do harm to our health. My participation in sports tells me that sports can make us healthy both physically and psychologically. It is also a good way for people to know each other and can promote friendship between people. So long as we are carefully enough, sports can do us nothing but good. 中学生学习时间长.压力大.专家建议学生每天课后应采取适当的方式放松自己.某英文报“学生习作 专栏正在就“学生适当的放松方式 这一话题进行征文.假设你是二十二中初三(3)班的班长.最近你对班上同学课后放松方式进行了调查.请根据表格提供的调查信息和要求写一篇短文向该报投稿. 对 象 二十二中初三(3)班 人 数 60人 常用放松方式 1.看电视 2.玩电脑游戏 4.进行体育锻炼(5人) 5.没有时间放松(5人) 你的观点 哪一种(些)放松方式是适当的? 为什么? 注意: 【查看更多】

     

    题目列表(包括答案和解析)

    近年来我国多地雾霾天气不断增多，严重地影响了人们的健康与生活。造成这一现象的主要原因是工厂排出的废气和汽车尾气等。请你根据以下三个方面的提示，以“Let’s Do Something to Save Our Environment”为题写一篇80词左右的短文。

    【参考词汇】?? disaster? n. 灾难；smog? n. 雾霾

    【写作要点】1、重要性：只有一个地球。 2、主要问题：污染、疾病、灾难。

    3、措施：停止污染、保护大自然。

    【写作注意】1、文中不能出现真实姓名、校名。 2、可适当发挥，以使行文连贯。

    3、文章标题和开头已给出，但不计入总词数。

    Let’s Do Something to Save Our Environment

    In the last few years, the smog has occurred (出现) a lot of times, it has done great harm to our daily life. The serious disease caused by the smog and the environment are getting more worse.

     

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    (11分)下图甲、乙分别表示我国医学工作者自主研制SARS灭活疫苗过程中，某志愿者接种疫苗后两周内体温和抗体浓度的变化。请据图回答下列问题：

    （1）注射疫苗后，志愿者出现轻度发热现象，调节机体产热的激素主要有          
                          ，维持体温恒定的调节方式是                      调节，
    体温调节中枢是______________。
    （2）若该志愿者注射疫苗后的第15天感染SARS病毒，请在乙图中画出其体内抗体变化曲线。抗体的本质是_________,由_____________直接产生，抗体合成及分泌的途径是________________________________________________________（2分） 。
    （3）研究发现SARS病毒的增殖需要逆转录酶，说明SARS病毒的遗传物质是       
    ；从遗传物质分析，研制SARS疫苗困难的主要原因是                            。 

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    （10分）碳酸钙常用作牙膏的摩擦剂。某同学设计了一种制备碳酸钙的方案，其流程图如下。（所用石灰石含有杂质SiO2）

    回答下列问题：
    （1）充分煅烧110吨石灰石得到固体66吨，则石灰石中碳酸钙的质量分数为      %。
    （2）假设第①步反应完全进行，则第②步反应过滤后得到的不溶液性滤渣的成分为
                     。
    （3）第③步反应一般不采用通入CO2的主要原因是                           ，相应的离子方程式为                                     。
    （4）CaCO3是一种难溶液物质，25℃时其KSP=2.8×10-9。现将等体积的CaCl2溶液与Na2CO3溶液混合，若Na2CO3溶液的浓度为2.0×10-4mol/L，则生成沉淀所需CaCl2溶液的物质的量浓度最小是                。
    （5）某生用石灰石为原料，设计了另一种制备碳酸钙的实验方案，其流程图如下

    与前一方案相比较，该方案的优点是               。

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    短文写作。（本题14分）

    每个人的成长都是一种蜕变的过程，从幼稚走向成熟，从逆境走向成功。请你用英语写一篇80词以上的短文，谈谈你在成长过程中所经历的最大的一次转变。

    内容要求：

    1. 变化前后分别是什么样子的？

    2. 促成你转变的主要原因是什么？

    3. 你为此变化付出了怎样的努力？

    注    意：短文中不允许出现与考生本人相关的真实姓名和校名等信息。

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    如图为人体部分特异性免疫过程的示意图，a、b、c表示细胞。请据图回答下列问题。

    (1)该特异性免疫属于       免疫，图中b细胞在人体内可以来自                   细胞。
    (2)图中a、b、c、d能够识别抗原的是         。（填字母）
    (3)若图中所示的抗原为酿脓链球菌，因其表面的抗原决定簇与人心脏瓣膜上的一种物质的表面结构十分相似，物质d向心脏瓣膜发起进攻，使人患上风湿性心脏病，这属于免疫失调中的             病。
    (4)当抗原经过⑤⑥过程时，人体内产生d的主要特点是数量多、速度快，与合成与分泌d有关的细胞器有           、           、
               、           。
    (5)研究发现，HIV病毒的增殖需要逆转录酶，从遗传物质分析，研究HIV疫苗比较困难的主要原因是                                                          。

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