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    D.发生冲突后应产生打闹的噪音.故选D 最恰当. 54 It is a thousand kilometers across that desert . The road is 1 nearly all the way. Sometimes there is a deep sand. A driver must then put his foot down hard and drive through! There are three small 2 along the way. Vick reached the first place at ten o'clock p. m. He had his 3 in a little restaurant there. It was a warm 4 in August. Vick wanted to 5 through the night. The nights are warm enough in August, but the days are very, very 6 . He left the restaurant at 11: 30 and drove over 7 hours. There wasn't a moon, but the 8 were wonderful. There was nothing else on die road. Vick thought, "It's an empty desert. No tree, house, man. " He could 9 the endless, white road in the car's headlights. A million stars looked down on him. It was two o'clock in the morning. Vick stopped the car. He was two hundred kilo­meters from the 10 town: "I'll light the cooker," he thought, "and make some tea. " He got out of the car. He heard some sounds, ten or fifteen meters 11 . He could not see anything in the darkness. A man said, "Good morning. It's a 12 morning, isn't it?" The man came forward ,out of the darkness; out of the desert. Vick did not move. The man said, "You are going to 13 some tea, aren't you? I often get a cup of tea at this time. It’s two o’clock. Cars always 14 near here at this time. Sometimes I get a 15 . Now listen, and I'll tell you a story. Then you'll give me-" 【查看更多】

     

    题目列表(包括答案和解析)

    细胞通讯是指一个细胞发出的信息通过介质传递到另一个细胞产生相应的反应。细胞间的通讯对于多细胞生物调节生命活动是必需的。下图是几种细胞通讯的实例，下列说法错误的是                     （   ）
    A．甲图中a是胰岛素，肝细胞上的受体与a结合后，可引起糖元的合成速率加快
    B．乙图中的b是细胞表面受体，其化学本质是糖蛋白
    C．丙图中的抗体是由游离于细胞质基质中的核糖体合成，内质网运输，高尔基体再加工后经外排方式分泌的，它的产生与释放都不需要能量
    D．发生丙图中生理过程的e细胞至少接受过两次过敏原的刺激，它释放的d物质为组织胺

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    下列群落的演替类型中，属于初生演替的是               
    A．外来物种入侵，改变群落物种组成B．弃耕农田上长出杂草、灌木
    C．在火山岩上长出地衣　D．对砍伐后的森林进行封山育林

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    下列群落的演替类型中，属于初生演替的是               
    A．外来物种入侵，改变群落物种组成B．弃耕农田上长出杂草、灌木
    C．在火山岩上长出地衣　D．对砍伐后的森林进行封山育林

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    下图是被子植物一生中的相关结构，请认真分析并回答：

    (1)A萌发时所需的外界环境条件是___________________(写出其中一条）。
    (2)B的主要部分是_____________。
    (3)C中的_____________是裸子植物所没有的。
    (4)D在完成_____________过程后，子房中的胚珠发育成          。
    (5) 假设图中C的颜色为红色，已知R是红色的显性基因，r为黄色的隐性基因，请你写出C果实的可能基因___________。

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    Many students in China are learning English. Some of these students are small children. Others are teenagers(青少年). Many are adults(成年人). Some study at school, others learn by themselves. A few learn English language over the radio, on TV, or in the films. One must work hard to learn another language.
    Why do all these people want to learn English? It is difficult to answer that question. Many boys and girls learn English at school because it is one of their subjects. They study their own(自己的) language and maths and English. Some people learn English because it is useful for their work. Many people often learn English for their higher studies, because at college or university(大学) some of their books are in English. Other people learn English because they want to read newspapers and magazines in English.
    【小题1】根据Others are teenagers(青少年). Many are adults(成年人).描述，可知选C。
    【小题2】根据短文第一段描述，可知孩子，年轻人和成人都在学英语。故选C。
    【小题3】根据短文第二段描述，可知每个人学英语都有不同的原因，故选D。
    【小题4】联系上文可知本文描述的是中国人学英语，故他们自己的语言是汉语，选A。
    【小题5】by表示通过某种方式，通过自己学习英语，及自学英语，故选B。
    【小题6】Are there many adults learning English in China?

    A．No, they aren’t.B．No, they are.
    C．Yes, there are.D．Yes, there aren’t.
    【小题7】________learn English.
    A．Only teenagers.
    B．Only adults.
    C．Small children, teenagers and adults.
    D．Only small children.
    【小题8】Which of the following is true?
    A． Most people learn English over the radio.
    B． All the people learn English at school.
    C． Students only learn their own language at school.
    D． Different people have different reasons for learning English.
    【小题9】“Their own language” means_____________.
    A．ChineseB．EnglishC．FrenchD．Japanese
    【小题10】What’s the Chinese meaning of “learn by themselves”?\
    A．和他们一起学习B．自学C．向他们学习D．通过学习

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