练习册

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    Fish have ears. Really. They're quite small and have no opening to the outside world carrying sound through the body. For the past seven years, Simon Thorrold, a university professor, has been examining fish ears, small round ear bones called otoliths. As fish grow, so do their otoliths. Each day, their otoliths get a ring of calcium carbonate . By looking through a microscope and counting these rings, Thorrold can tell the exact age of a young fish. As a fish gets older, its otoliths no longer get daily rings. Instead, they get yearly rings, which can also be counted, giving information about the fish's age, just like the growth rings of a tree. Ring counting is nothing new to fish scientists. But Thorrold has turned to a new field. They're examining the chemical elements of each otolith ring. The daily ring gives us the time, but chemistry tells us about the environment in which the fish swam on any given day. These elements tell us about the chemistry of the water that the fish was in. It also says something about water temperature, which decides how much of these elements will get together within each otolith ring. Thorrold can tell, for example, if a fish spent time in the open ocean before entering the less salty water of coastal areas. He can basically tell where fish are spending their time at any given stage of history. The Atlantic croaker is a popular saltwater food fish. Thorrold and his assistant have successfully followed the traveling of young fish from mid-ocean to the coast, a journey of many hundreds of miles. Of course, this is important to managers in the fish industry because they know nearly nothing about the whereabouts of the young fish for most food fish in the ocean. Eager to learn about his technology, fish scientists are now lending Thorrold their ears. 【查看更多】

     

    题目列表(包括答案和解析)

    When you read an article you will understand and remember it better if you can work out how the writer has put the ideas together．Sometimes a writer puts ideas together by asking questions and then answering them．For example，if the article is about groundhogs（土拨鼠），the set of questions in the writer’s head might be：

    What does a groundhog look like？

    Where do groundhogs live？

    What do they eat？…

    In the article，the author might answer those questions．

    Sometimes an author writes out her questions in the article．These questions give you signals．They tell you what the author is going to write next．Often an author has a question in her head but she doesn’t write it out for you．You have to work out her question for yourself．Here’s a sample reading for you to practice this method.

    Earthworms

    Do you know how many kinds of earthworms there are？There are about 1800 kinds in the world！ They can be brown，purple，green．They can be as small as 3 cm long and as large as 3 m long．

    The best time to see earthworms is at night，especially a cool，damp night．That’s when they come up from their burrows（地洞）to hunt for food．Earthworms don’t like to be in the sun．That’s because they breathe through their skin，and they can’t breathe if their skin gets too dry．Earthworms must come out of the earth if it rains a lot，because they can't breathe in their flooded burrows．What a dangerous life！

    Earthworms don't have eyes，so how can they tell when it's dark？ They have special places on their skin that are sensitive to light．These spots tell whether it’s light or dark．If you shine a flashlight on an earthworm at night，it will quickly disappear into the ground．

    Earthworms don't have ears either，but they can hear by feeling movements in the earth．If you want to hear like an earthworm，lie on the ground with your fingers in your ears．Then have a friend stamp his or her feet near you．This is how earthworms feel birds and people walking，and moles digging，near them．

    Earthworms are useful．Farmers and gardeners like having lots of earthworms in their land because the worms help to make better soil when they dig．That digging keeps the soil loose and airy（通风的）．In one year earthworms can pile up as much as 23,000 kg of castings in an area about the size of a football field．

    1.What’s the purpose of reading Earthworms?

    A．To show the special life facts of earthworms.

    B．To explain the differences from the groundhogs.

    C．To put the writer’s idea into real use.

    D．To make the readers think more clearly.

    2.Which question CANNOT be answered in the passage?

    A．How do earthworms help with gardeners?

    B．What life are earthworms living with?

    C．When may people observe earthworms?

    D．Why can human listen like earthworms?

    3.How can you understand Earthworms better according to this passage?

    A．Read, ask and answer questions in your own head while reading.

    B．Read to work out all the questions in the writer’s head while reading.

    C．Read and check all the things that are not clear to you again and again.

    D．Read for general ideas and discuss or compare with other similar topics.

    4.What’s the best title for the passage?

    A．One way to help with understanding

    B．One way to practice with a new idea

    C．One way to learn to be a wise writer

    D．One way to be clearer about worms

     

    查看答案和解析>>

    When you read an article you will understand and remember it better if you can work out how the writer has put the ideas together．Sometimes a writer puts ideas together by asking questions and then answering them．For example，if the article is about groundhogs（土拨鼠），the set of questions in the writer’s head might be：
    What does a groundhog look like？
    Where do groundhogs live？
    What do they eat？…
    In the article，the author might answer those questions．
    Sometimes an author writes out her questions in the article．These questions give you signals．They tell you what the author is going to write next．Often an author has a question in her head but she doesn’t write it out for you．You have to work out her question for yourself．Here’s a sample reading for you to practice this method.
    Earthworms
    Do you know how many kinds of earthworms there are？There are about 1800 kinds in the world！ They can be brown，purple，green．They can be as small as 3 cm long and as large as 3 m long．
    The best time to see earthworms is at night，especially a cool，damp night．That’s when they come up from their burrows（地洞）to hunt for food．Earthworms don’t like to be in the sun．That’s because they breathe through their skin，and they can’t breathe if their skin gets too dry．Earthworms must come out of the earth if it rains a lot，because they can't breathe in their flooded burrows．What a dangerous life！
    Earthworms don't have eyes，so how can they tell when it's dark？ They have special places on their skin that are sensitive to light．These spots tell whether it’s light or dark．If you shine a flashlight on an earthworm at night，it will quickly disappear into the ground．
    Earthworms don't have ears either，but they can hear by feeling movements in the earth．If you want to hear like an earthworm，lie on the ground with your fingers in your ears．Then have a friend stamp his or her feet near you．This is how earthworms feel birds and people walking，and moles digging，near them．
    Earthworms are useful．Farmers and gardeners like having lots of earthworms in their land because the worms help to make better soil when they dig．That digging keeps the soil loose and airy（通风的）．In one year earthworms can pile up as much as 23,000 kg of castings in an area about the size of a football field．
    【小题1】What’s the purpose of reading Earthworms?

    A．To show the special life facts of earthworms.
    B．To explain the differences from the groundhogs.
    C．To put the writer’s idea into real use.
    D．To make the readers think more clearly.
    【小题2】Which question CANNOT be answered in the passage?
    A．How do earthworms help with gardeners?
    B．What life are earthworms living with?
    C．When may people observe earthworms?
    D．Why can human listen like earthworms?
    【小题3】How can you understand Earthworms better according to this passage?
    A．Read, ask and answer questions in your own head while reading.
    B．Read to work out all the questions in the writer’s head while reading.
    C．Read and check all the things that are not clear to you again and again.
    D．Read for general ideas and discuss or compare with other similar topics.
    【小题4】What’s the best title for the passage?
    A．One way to help with understanding
    B．One way to practice with a new idea
    C．One way to learn to be a wise writer
    D．One way to be clearer about worms

    查看答案和解析>>

    阅读理解。
          Do you know fish come out of  eggs when they are born? After the little fish comes out of the egg, it
    eats the food in the egg.  When it is big, it leaves the egg. It swims in the water. You can see the eyes and
    nose. Its ears are hidden in the head.Some fish eat other fish. Some fish have small mouths and teeth and
    they often eat plants. The fish that eat other fish need larger mouths and strong teeth. Fish are usually dark on the top and light on the bottom.
    阅读短文，根据短文内容回答下列问题。
    1. 将画线部分翻译成中文。
                                                                    
    2. What do baby fish eat when they come out of the egg?
                                                                    
    3. Do they have ears? Where are they?
                                                                    
    4. Do all the fish eat fish?
                                                                    

    查看答案和解析>>

    阅读理解。
         Do you know that fish comes out of eggs when it is born(出生)? After the little fish comes out of the egg, it eats
    the food in the egg. When it is big, it leaves the egg. It swims in the water.
         You can see the eyes and nose. Its ears are hidden(藏) in the head.
         Some fishes eat other small fishes. Some fishes have small mouths and teeth and they often eat plants(植物).
    根据短文内容用适当的单词填空.
         The fish is in an (1)__________ before it is born. The fish eat the (2)_________ in the egg after they come out
    of the egg. When the fish is big, it doesn't (3)__________ in the egg any more. In fact(事实上), a fish (4)_______
    ears, but they are hidden in the head. (5)________ big fishes eat small fishes.

    查看答案和解析>>

    When you read an article you will understand and remember it better if you can work out how the writer has put the ideas together．Sometimes a writer puts ideas together by asking questions and then answering them．For example，if the article is about groundhogs（土拨鼠），the set of questions in the writer’s head might be：
    What does a groundhog look like？
    Where do groundhogs live？
    What do they eat？…
    In the article，the author might answer those questions．
    Sometimes an author writes out her questions in the article．These questions give you signals．They tell you what the author is going to write next．Often an author has a question in her head but she doesn’t write it out for you．You have to work out her question for yourself．Here’s a sample reading for you to practice this method.
    Earthworms
    Do you know how many kinds of earthworms there are？There are about 1800 kinds in the world！ They can be brown，purple，green．They can be as small as 3 cm long and as large as 3 m long．
    The best time to see earthworms is at night，especially a cool，damp night．That’s when they come up from their burrows（地洞）to hunt for food．Earthworms don’t like to be in the sun．That’s because they breathe through their skin，and they can’t breathe if their skin gets too dry．Earthworms must come out of the earth if it rains a lot，because they can't breathe in their flooded burrows．What a dangerous life！
    Earthworms don't have eyes，so how can they tell when it's dark？ They have special places on their skin that are sensitive to light．These spots tell whether it’s light or dark．If you shine a flashlight on an earthworm at night，it will quickly disappear into the ground．
    Earthworms don't have ears either，but they can hear by feeling movements in the earth．If you want to hear like an earthworm，lie on the ground with your fingers in your ears．Then have a friend stamp his or her feet near you．This is how earthworms feel birds and people walking，and moles digging，near them．
    Earthworms are useful．Farmers and gardeners like having lots of earthworms in their land because the worms help to make better soil when they dig．That digging keeps the soil loose and airy（通风的）．In one year earthworms can pile up as much as 23,000 kg of castings in an area about the size of a football field．

    1. 1.

      What’s the purpose of reading Earthworms?

      1. A.
        To show the special life facts of earthworms
      2. B.
        To explain the differences from the groundhogs
      3. C.
        To put the writer’s idea into real use
      4. D.
        To make the readers think more clearly
    2. 2.

      Which question CANNOT be answered in the passage?

      1. A.
        How do earthworms help with gardeners?
      2. B.
        What life are earthworms living with?
      3. C.
        When may people observe earthworms?
      4. D.
        Why can human listen like earthworms?
    3. 3.

      How can you understand Earthworms better according to this passage?

      1. A.
        Read, ask and answer questions in your own head while reading
      2. B.
        Read to work out all the questions in the writer’s head while reading
      3. C.
        Read and check all the things that are not clear to you again and again
      4. D.
        Read for general ideas and discuss or compare with other similar topics
    4. 4.

      What’s the best title for the passage?

      1. A.
        One way to help with understanding
      2. B.
        One way to practice with a new idea
      3. C.
        One way to learn to be a wise writer
      4. D.
        One way to be clearer about worms

    查看答案和解析>>


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