练习册

  • 练习册
  • 试题
    A..since 表示原因.由于服务员认识作者.此句才提到服务员告诉侦探是他搞错了. 【查看更多】

     

    题目列表(包括答案和解析)

    （6分）据图回答下列问题：

    （1）据图1，若某植物幼苗已表现出向光性，且测得其向光面的生长素浓度为m，则背光面生长素浓度范围是             。
    （2）据图1可知，除草剂灭草的原理是使杂草的生长素浓度大于       （填图1中字母）。
    （3）在探究生长素促进插条生根的最适浓度时，一名技术人员用几种不同浓度生长素溶液处理插条基部，然后在沙床中培养，观察生根情况。图2为生长素促进枝条生根的情况。请结合图1判断，在下列各项浓度值中，最好选用（   ）
    A．3mg·mL-1B．6 mg·mL-1C．9 mg·mL-1D．4.5 mg·mL-1
    （4）生长素的主要作用是促进细胞纵向伸长，其作用机理如图3所示，请回答下列问题：

    ①生长素作用的第一步是与细胞膜上的受体结合，形成“激素—受体复合物”，这一过程体现了细胞膜的              功能。
    ②实验发现，细胞在持续生长过程中，细胞壁将发生一定变化，出现这种现象的原因是由于              （填细胞器）为细胞壁添加了新的成分。
    ③此外，Ca2+ 还能激活细胞中的转录因子，它进入细胞核后，能引起         酶催化mRNA的合成。

    查看答案和解析>>

    短文写作。
         假设你就“对独生子女政策的看法”在社区展开调查，请根据表格所提供的信息在英语课上介绍调查
    的结果。
    80%的人支持
    20%的人不同意
    原因：
    由于人口太多，引发许多问题，如：水，
    食品等缺乏…，政策能控制人口，使国家发展，
    生活改善…    		 原因：
    只有一个孩子，太孤独…由
    于家人溺爱，不易相处…

          要求：1. 要点完整，适当发挥，意思连贯，符合逻辑。
                    2. 词数80左右，开头已给不记入总词数。
          Here is a result of the survey about how people like the one-child policy.                                                   
                                                                                                                                                                   
                                                                                                                                                                   

    查看答案和解析>>

    　　When my family moved to America from a small village in Guangdong, China, we brought not only our luggage, but also our village rules, customs and culture．One of the rules is that young people should always respect(尊敬)elders．Unluckily, this rule led to my very first embarrassment in the United States．

    　　I had a part-time job as a waiter in a Chinese restaurant．One time, when I was serving food to a middle-aged couple, the wife asked me how the food could be served so quickly．I told her that I had made sure they got their food quickly because I always respect the elderly．As soon as I said that, her face showed great displeasure．My manager, who happened to hear I said, took me aside and gave me a long lecture about how sensitive(敏感的)Americans are and how they dislike the description “old”．I then walked back to the table and apologized to the wife．After the couple heard my reason, they understood that the problem was caused by cultural differences, so they laughed and were no longer angry．

    　　In my village in China, people are proud of being old．Not so many people live to be seventy or eighty, and people who reach such an age have the most knowledge and experience．Young people always respect older people because they know they can learn from their rich experience．

    　　However, in the United States, people think “growing old” is a problem since “old” shows that a person is going to retire or that the body is not working well．Here many people try to keep themselves away from growing old by doing exercises or jogging, and women put on makeup, hoping to look young．When I told the couple in the restaurant that I respect the elderly, they got angry because this caused them to feel they had failed to stay young, I had told them something they didn’t want to hear．

    　　After that, I changed the way I had been with older people．It is not that I don’t respect them any more; I still respect them, but now I don’t show my feelings through words．

    根据短文内容，选择最恰当的答案，用A, B, C或D表示。

    (1)

    Jack brought the couple their food very fast because ________．

    [　　]

    A．

    the manager asked him to do so

    B．

    he respected the elderly

    C．

    the couple wanted him to do so

    D．

    he wanted more pay

    (2)

    When Jack called the couple “elderly,” they became ________．

    [　　]

    A．

    nervous

    B．

    satisfied

    C．

    unhappy

    D．

    excited

    (3)

    In Jack’s hometown, ________．

    [　　]

    A．

    people dislike being called “old”

    B．

    people are proud of being old

    C．

    many people reach the age of seventy or eighty

    D．

    the elderly are the first to get food in restaurants

    (4)

    After this experience, Jack ________．

    [　　]

    A．

    lost his job in the restaurant

    B．

    made friends with the couple

    C．

    no longer respected the elderly

    D．

    changed his way with older people

    (5)

    Which of the following is TRUF?

    [　　]

    A．

    The more Jack explained, the angrier the couple got．

    B．

    Jack wanted to show his feelings through words after his experience．

    C．

    The manager went back to the table and apologized to the couple．

    D．

    From this experience, Jack learned more about American culture．

    (6)

    Which is the best title for this passage?

    [　　]

    A．

    Different countries, different customs

    B．

    Old people, old customs

    C．

    Different restaurants, different services

    D．

    Differences between old and young

    查看答案和解析>>

    If you had only three years left to live, how would you spend your time? It’s a hard question and few of us would even like to think about it. But 18-year-old Huang Ge has to answer this question and he says, “I want to thank the people who have helped me.”

    At the age of one, Huang’s mother left the family. Six years later, he was badly ill. He has been using a wheelchair since 9 years old. Doctors said he would only live to 18.After Huang’s story went on TV, hundreds of people sent money to help him. The boy was so moved that he decided to thank every one of them. But he has to be tied to his wheelchair. And the family can only afford a three-wheeled motorcycle(三轮摩托). Since 2003, the father and son have traveled 14,000 kilometers, to 10 provinces, and thanked more than 30 helpers.          

    “I am moved by the story of the boy. We need the courage to face death, and we should also show our gratefulness to those who help us,” says an online post on CCTV. com.

    1._________, Huang Ge started to use a wheelchair.

    A．When he was 9 years old                 B．When he was 18 years old

    C．When he was 10 years old                D．When he was 6 years old

    2.Huang and his father took a _________to thank the helpers.

    A．train             B．ship              C．motorcycle        D．bus

    3.The underlined word “gratefulness” means _______________

    A．诚信             B．奉献             C．宽容             D．感谢

    4.Which of the following is NOT true according to the passage?

    A．Hundreds of people sent money to help him.

    B．Huang Ge’s mother left the family.

    C．Huang Ge and his father have thanked more than 30 helpers.

    D．Huang Ge was badly ill at the age of one.

    5.Which is the best title for the passage?

    A．A Great Success                        B．An Interesting Trip

    C．A Grateful Heart                        D．A TV Show

     

    查看答案和解析>>

    We have studied English _____2005.

    A．since

    B．for

    C．in

    D．on

     

    查看答案和解析>>


    同步练习册答案