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    ---How often does she have dancing classes?

    ---_________.

    A．On Saturday afternoon

    B．At 9 o’clock

    C．Once a week

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    Simple Scientific Experiment（实验）

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    Materials: Some clean iron nails(铁钉) ; test tubes(试管); test tube holder; cotton wool; oil; Bunsen burner.

    Iron in dry air

    Method

    (1) Put some iron nails at the bottom of a test tube.

    (2) Push some cotton wool down the tube.

    (3) Leave the tube for one week.

    Result

    After one week, the nails have not rusted.

    Conclusion

    Iron does not rust in dry air.

    (4) Add some oil to the water. (This will keep air out of the water.)

    (5) Leave the tube for one week.

    Result

    The nails do not rust in the tube with air-free water.

    Conclusion

    Iron does not rust in air-free water.

    Iron in ordinary water

    Method

    (1) Half –fill a test tube with water and add

    two or three clean nails.

    (2) Leave the tube for one week.

    Result

    The nails rust in the tube with common water.

    Conclusion

    Iron rusts in common water.

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