tep 1 greetings and lead－in
t: hello, everyone.
ss: hello, mr li.
t: sit down, please. now in this unit we are going to learn something about general science and learn how to express the numbers. first of all, let’s learn the new words. (show the new words on the screen.)
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liquid 液体 expand 膨胀 contract 收缩 substance 物质 mixture 混合物 oxygen 氧气 electricity 电 |
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