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    As suggested by the text, how can glass be made less brittle? A.It can be heated and then cooled quickly. B.It can be cooled and then heated slowly. C.It can be heated and then cooled slowly. D.It can be cooled and then heated quickly. (C) "I would almost rather see you dead," Robert S. Cassatt, a leading bankerof Philadelphia, shouted when his twenty-year-old eldest daughter announced that she wanted to become an artist. In the 19th century,playing at drawing or painting on dishes was all right for a young lady, but serious work in art was not. And when the young lady's family ranked amongthe best of Philadelphia's socialfamilies, such an idea could not even be considered. That was how Mary Cassatt, born 1844, began her struggle as an artist. She did not tremble before her father's anger. Instead, she opposedhim with courage and at last made him change his mind. Mary Cassatt gave up her social positionand all thought of a husband and a family, which in those times was unthinkable for a young lady. In the end, after long years of hard work and perseverance, she became America's most important woman artist and the internationally recognized leading woman painter of the time. 【查看更多】

     

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    Annealing is a way of making metal softer by heating it and then letting it cool very slowly. If metal is heated and then cooled very quickly , for example by dipping it in water , it will be very hard but also very brittle(脆)---that is , It will break easily. Metal that has been annealed is soft but does not break as easily . It is possible to make metal as hard or as soft as is wished, by annealing it. The metal is heated, and allowed to cool slowly , for a certain length of time. The longer the heated metal takes to cool slowly , the softer it becomes . Annealing can also be used on other materials, such as glass.

    1. Annealing can make metal _______________.

    A．hard and tough (韧)                      B．hard but brittle

    C．soft but tough                          D．soft and brittle

    2. Why do people put hot metal in water ? ____________

    A．To make it hard                         B．To make it soft

    C．To make it cool                         D．To make it brittle

    3. As suggested by the text , how can glass be made less brittle ?____________

    A．It can be heated and then cooled quickly

    B．It can be cooled and then heated slowly

    C．It can be heated and then cooled slowly

    D．It can be cooled and then heated quickly

     

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    Annealing is a way of making metal softer by heating it and then letting it cool very slowly. If metal is heated and then cooled very quickly , for example by dipping it in water , it will be very hard but also very brittle(脆)---that is , It will break easily. Metal that has been annealed is soft but does not break as easily . It is possible to make metal as hard or as soft as is wished, by annealing it. The metal is heated, and allowed to cool slowly , for a certain length of time. The longer the heated metal takes to cool slowly , the softer it becomes . Annealing can also be used on other materials, such as glass

    1. 1.

      Annealing can make metal______.

      1. A.
        hard and tough (韧)
      2. B.
        hard but brittle
      3. C.
        soft but tough
      4. D.
        soft and brittle
    2. 2.

      Why do people put hot metal in water ?

      1. A.
        To make it hard
      2. B.
        To make it soft
      3. C.
        To make it cool
      4. D.
        To make it brittle
    3. 3.

      As suggested by the text , how can glass be made less brittle ?

      1. A.
        It can be heated and then cooled quickly
      2. B.
        It can be cooled and then heated slowly
      3. C.
        It can be heated and then cooled slowly
      4. D.
        It can be cooled and then heated quickly

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      Annealing is a way of making metal softer by heating it and then letting it cool very slowly. If metal is heated and then cooled very quickly, for example by dipping (浸) it in water, it will be very hard but also very brittle (脆) —that is , it will break easily. Metal that has been annealed is soft but does not break as easily. It is possible to make metal as hard or as soft as is wished, by annealing it. The metal is heated, and allowed to cool slowly for a certain length of time. The longer the heated metal takes to cool slowly, the softer it becomes. Annealing can also be used on other materials, such as glass.

    1. Annealing can make metal      

    A. hard and tough (韧).               B. hard but brittle.

    C. soft but tough.                    D. soft and brittle.

    2.Why do people put hot metal in water?

    A. To make it hard.                   B. To make it soft.

    C. To make it cool.                   D. To make it brittle.

    3.As suggested by the text, how can glass be made less brittle?

    A. It can be heated and then cooled quickly.

    B. It can be cooled and then heated slowly.

    C. It can be heated and then cooled slowly.

    D. It can be cooled and then heated quickly.

     

     

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    Annealing

    Annealing is a way of making metal softer by heating it and then letting it cool very slowly, if metal is heated and then cooled very quickly, for example by dipping(浸) it in water, it will be very hard but also very brittle(脆)—that is, it will break easily. Metal that has been annealed is soft but does not breaks as easily. It is possible to make metal as hard or as soft as is wished, by annealing it. The metal is heated, and allowed to cool slowly for a certain length of time. The longer the heated metal takes to cool slowly, the softer it becomes. Annealing can also be used on other material, such as glass.

    1. Annealing can make metal ____

    　　A. hard and tough(韧)　B. hard but brittle　　C. soft but tough　　D. soft and brittle

    2. Why do people put hot metal in water?

    　　A. To make it hard.　　B. To make it soft.　C. To make it cool.　D. To make it brittle

    3. In annealing, the required hardness of a metal depends on 　______

    　　A. the quantity of water used　B. the temperature of the metal

    　　C. the softness of the metal　  D. the timing of the operation

    4. As suggested by the text, how can glass be made less brittle?

    　　A. It can be heated and then cooled quickly.

    　　B. It can be cooled and then heated slowly.

    　　C. It can be heated and then cooled slowly.

    D. It can be cooled and then heated quickly.

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    Annealing is a way of making metal softer by heating it and then letting it cool very slowly．If metal is heated and then cooled very quickly, for example by dipping(浸)it in water, it will be very hard but also very brittle(脆)that is, it will break easily．Metal that has been annealed is soft but does not break as easily．It is possible to make metal as hard or as soft as is wished, by annealing it．The metal is heated, and allowed to cool slowly for a certain length of time．The longer the heated metal takes to cool slowly, the softer it becomes．Annealing can also be used on other material, such as glass．

    (1)

    Annealing can make metal ________．

    [　　]

    A．

    hard and tough(韧)

    B．

    hard but brittle

    C．

    soft but tough

    D．

    soft and brittle

    (2)

    Why do people put hot metal in water?

    [　　]

    A．

    To make it hard

    B．

    To make it soft．

    C．

    To make it cool．

    D．

    To make it brittle．

    (3)

    In annealing, the required hardness of a metal depend on ________．

    [　　]

    A．

    the quantity of water used

    B．

    the temperature of the metal

    C．

    the softness of the metal

    D．

    the timing of the operation

    (4)

    As suggested by the text, how can glass be made less brittle?

    [　　]

    A．

    It can be heated an then cooled quickly．

    B．

    It can be cooled and then heated slowly．

    C．

    It can be heated and then cooled slowly．

    D．

    It can be cooled and then heated quickly．

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