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高一英语教案:Unit13 The water planet(第三课时)(2)

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    CStep Ⅱ Word Study
    T:Now please turn to Page 21.Look at the first part of Word Study.There are some words learnt in the last period,but the letters of these words are in the wrong order.Now I will give you a few minutes to put the letters in the correct order.
    (A few minutes later,teacher may ask some students to spell their answers and give the Chinese meaning of each word to all the students.Finally teacher writes the correct words on the blackboard.)
    1 otmas atoms
    2 tanomu amount
    3 sdlio solid
    4 oasbrb absorb
    5 cgrnetidea centigrade
    6 sag gas
    7 nhroygde hydrogen
    8 yoxgen oxygen
    9 assm mass
    10 fatol float
    T:Good work.Next look at the screen and try to complete the following sentences by filling in the blanks with the proper words.The first letter has been given and some words can be used more than once.If you need,you can have a discussion with your partner.
    (Teacher uses the multimedia to show the following sentences on the screen.)
    1.The water molecule is made up of two h_____ atoms and one o_____.
    2.Water is a l_____ at room temperature,but it turns into a s_____ when the temperature drops below 0℃ and into a g_____ when heated above 100℃.
    3.An a_____ is the smallest part of any living or nonliving thing.
    4.Places by the sea often have a s_____ climate that is never too hot or too cold,because water can a_____ and release a lot of heat.
    5.Soil can a______ water,so it helps keep water from flowing away.
    6.Marine scientists study the r_____ between living creatures and their habitat in the ocean.
    7.Salt water has a lower f______ point and is heavier than fresh water.
    8. Oil has a density lower than 1000 kg/m3,so it will f______ on water.
    (Teacher gives students enough time to prepare and then check their answers.) (责任编辑:admin)
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