练习册

  • 练习册
  • 试题
    Will there be a strong wind the north the Huanghe River ? A. to... of B. to... off C. at... of D. on, off 【查看更多】

     

    题目列表(包括答案和解析)

    Three kids have been learning chemistry for only a few months. But they have already begun to challenge (挑战) a world famous scientist!

       Li Weichi, Huang Runling, and Xiao Yan are from Zhongshan Huaqiao Middle School in Guangdong. They have just found a red cabbage that could be a new kind of acid-base indicator (酸碱指示剂). They want it to take the place of litmus (石蕊) paper.

    "We've learnt to think of and ask questions about life by ourselves," said Li, "We work well with each other."

       British scientist Robert Boyle discovered the use of litmus paper over 300 years ago. Now it is used widely in experiments all over the world.

       But when the kids did some experiments in class last winter, they saw that the litmus paper didn’t turn very blue with base matter. It's hard to get a clear result.

      Will there be a better indicator than litmus paper? The three kids decided to try and find out!

        How? They went to collect over 40 plants in parks, gardens and markets. Then they ground (研磨) leaves, flowers and stems (茎) to get the pigments (色素) from them.

       The kids mixed pigments with acid and base. They spent months watching carefully to see which paper showed the best colour change. They decided it was the litmus paper!

    "It's our first scientific journey, Huang said, "But it makes me want to try harder."

    1. Whom did the three kids want to challenge?

    A. Their chemistry teacher.     B. Their headmaster.

    C. Robert Boyle              D. Thomas Edison

    2. From the text, a red cabbage is a kind of ____.

    A. plant　　B. animal　　C. paper　　D. liquid

    3.What is widely used as the acid-base indicator now?

    A. red cabbage              B. litmus paper

    C. any plant                D. any flower 

    4.The story mainly tells us ____.

    A. how to make litmus paper    B. about the three kids' spirit

    C. scientists were wrong        D. the kids are heroes

     

    查看答案和解析>>

    1 

    Three kids have been learning chemistry for only a few months. But they have already begun to challenge (挑战) a world famous scientist!

    Li Weichi, Huang Runling, and Xiao Yan are from Zhongshan Huaqiao Middle School in Guangdong. They have just found a red cabbage that could be a new kind of acid-base indicator (酸碱指示剂). They want it to take the place of litmus (石蕊) paper.

    "We've learnt to think of and ask questions about life by ourselves," said Li, "We work well with each other."

    British scientist Robert Boyle discovered the use of litmus paper over 300 years ago. Now it is used widely in experiments all over the world.

    But when the kids did some experiments in class last winter, they saw that the litmus paper didn’t turn very blue with base matter. It's hard to get a clear result.

    Will there be a better indicator than litmus paper? The three kids decided to try and find out!

    How? They went to collect over 40 plants in parks, gardens and markets. Then they ground (研磨) leaves, flowers and stems (茎) to get the pigments (色素) from them.

    The kids mixed pigments with acid and base. They spent months watching carefully to see which paper showed the best color change. They decided it was the litmus paper!

    "It's our first scientific journey, Huang said, "But it makes me want to try harder."

    1.Whom did the three kids want to challenge?

    A. Their chemistry teacher.

    B. Their headmaster.

    C. Robert Boyle

    D. Thomas Edison

    2.From the text, a red cabbage is a kind of ____.

    A. plant　　B. animal　　C. paper　　D. liquid

    3.What is widely used as the acid-base indicator now?

    A. red cabbage              B. litmus paper

    C. any plant                D. any flower 

    4.The story mainly tells us ____.

    A. how to make litmus paper

    B. about the three kids' spirit

    C. scientists were wrong

    D. the kids are heroes

     

    查看答案和解析>>

    听力部分(一至四题)

    听句子，选画面(共5小题，每小题1分，共5分)

    1．________　2．________　3．________　4．________　5．________

    二、听对话，选择最佳答案(共10小题，每小题1分，共10分)

    你将听到3段对话，请根据对话内容，选出每个问题的最佳答案。每段对话读两遍。

    请听第1段对话，回答第6－8小题。

    6．Where is Tom going?

    A．To school．

    B．Home．

    C．To the Old People’s Home．

    7．What is Betty going to do for the old people?

    A．Cook for them．

    B．Read books to them．

    C．Clean the house．

    8．How often does Betty go there?

    A．Once a week．

    B．Once a month．

    C．Twice a month．

    请听第2段对话，回答第9－11小题。

    9．Whose textbook is this?

    A．Li Lei’s．

    B．Lucy’s．

    C．Mary’s．

    10．What does Mary wear?

    A．A white sweater and blue jeans．

    B．A blue sweater and white jeans．

    C．A white blouse and black jeans．

    11．Where does the conversation probably take place?

    A．In a hospital．

    B．At school．

    C．In a shop．

    请听第3段对话，回答第12－15小题。

    12．What’s the movie about?

    A．It’s about a nurse．

    B．It’s about a war．

    C．It’s about some children．

    13．Where’s Lucy’s mother from?

    A．From the USA．

    B．From England．

    C．From France．

    14．Why can’t Lucy see a movie on Wednesday afternoon?

    A．Because she will do lots of housework．

    B．Because she will take her mother to see a doctor．

    C．Because she will go shopping with her mother．

    15．When will the film begin?

    A．At 2 o’clock．

    B．At 3 o’clock．

    C．At 4 o’clock．

    三、听短文，选择最佳答案(共5小题，每小题2分，共10分)

    你将听到一篇短文，请根据短文内容，选出每个问题的最佳答案。短文读两遍。

    16．When will the School Open Day be held?

    A．On December 20th．

    B．On December 21st．

    C．On December 25th．

    17．Where will the Christmas tree be put?

    A．In front of the school hall．

    B．Behind the school hall．

    C．In the school hall．

    18．What competition will there be?

    A．A singing competition．

    B．A Christmas card competition．

    C．A Christmas gift competition．

    19．Who is Miss Donna Eaton?

    A．A famous singer．

    B．A class teacher．

    C．A famous dancer．

    20．How long will the School Open Day last?

    A．Six hours．

    B．Seven hours．

    C．Eight hours．

    四、听短文，填信息(共5小题，每小题1分，共5分)

    你将听到一篇短文，请根据短文内容，每空一词。短文读两遍。

    查看答案和解析>>

    阅读理解

    　　First it was an earthquake．Then came a terrible tsunami．These natural disasters killed thousands of people in Japan on Mar．11, 2011．Then a nuclear crisis(核危机)put the island in danger and shocked the world．

    　　Damaged by the earthquake and tsunami, Fukushima Daiichi nuclear plant(福岛第一核电站)has put out dangerous radioactive(放射性的)materials．Experts from several countries are working to control the crisis．

    　　Although the reports say the leak so far will not cause huge health problems, people are worrying about nuclear safety．Switzerland has stopped plans to build new nuclear plants．Germany raised questions about its nuclear future．

    　　As for China, the government has suspended approving(暂停审批)new nuclear power stations and stepped up safety checks at existing plants, Xinhua reported．But it is reported that all nuclear power stations in China are safe．

    　　A nuclear power plant creates electricity．It is a clean energy source．In 1954, the world's first nuclear power plant was built in Russia．From then on, nuclear power has been widely used．

    　　But nuclear power plants have hidden problems．If radioactive materials get into the air or water, they can pollute soil and plants and harm humans and animals．Nuclear accidents, such as the Chernobyl(切尔诺贝利)disaster in 1986 in the Ukraine, have caused great damage to the nearby people and the environment．

    　　Will there be another choice for energy that we can use in the future? In recent years, scientists have found ways to make electricity from sunshine, wind and garbage．

    　　Some scientists say hydrogen(氢气)may be used to create power．Hydrogen is a clean resource to use, and will never disappear．Some car companies have already developed cars powered by hydrogen．But still, the technology for its production is only in early stages of development．

    (1)

    Which is the correct order of the following statements?

    a．the leak of radioactive materials

    b．a tsunami

    c．an earthquake

    d．a nuclear crisis

    [　　]

    A．

    b－c－d－a

    B．

    c－b－a－d

    C．

    b－d－c－a

    D．

    c－a－b－d

    (2)

    The first nuclear power plant has been in use for ________ years．

    [　　]

    A．

    35

    B．

    57

    C．

    53

    D．

    56

    (3)

    The underlined word “ they” in the six paragraph means ________．

    [　　]

    A．

    hidden problems

    B．

    nuclear accidents

    C．

    radioactive materials

    D．

    Japanese

    (4)

    We can infer that ________．

    [　　]

    A．

    Nuclear has huge power but it is harmless to people．

    B．

    People are not afraid of nuclear safety because experts have confirmed the leak so far will not cause huge health problems

    C．

    As a new clean power, Hydrogen will be in used very soon．

    D．

    China will not build new nuclear power plants in the next few years．

    (5)

    What is the main idea of the passage?

    [　　]

    A．

    Another choice for energy in the future．

    B．

    A terrible earthquake in Japan．

    C．

    Hydrogen will surely take the place of nuclear power very soon．

    D．

    A clean energy source－nuclear power

    查看答案和解析>>

    请根据首字母提示填空。（每小题1分，共10分）
    　　53. I will bring my computer to the meeting, and you can also bring y__________.
    　　54. I hope all my dreams will come t__________ one day.
    　　55. Lingling and I are going to have a picnic. Would you like to j_________ us?
    　　56. There is a s_________ on today, and everything in the shopping mall is half price.
    　　57. The box is very h__________. Can you help me carry it?
    　　58. If you want to go to the airport, you can t__________ a bus or a taxi.
    　　59. After you pay for it, you can r__________ it a few days later by post.
    　　60. On Sunday afternoons, we c__________ litter in the park, and throw it in the dustbin.
    　　61. I’m going on a summer c________ in Sydney, Australia.
    　　62. When you cross the road, you should be c____________ with the traffic.
    　　

    查看答案和解析>>


    同步练习册答案