摘要： (出示火星及罗马战神的图片.简单介绍火星.呈现部分生词.) T: This is a picture of Mars. It is the fourth planet from the sun in the solar system. It is named after Mars, the Roman god of war. It is much smaller than the earth. Its diameter is half of the earth’s. solar system Roman adj. diameter n. T: Do you want to know something more about Mars? Ss: Yes. T: OK, please read 1a quickly. Guess the meanings of the other new words and grasp the main idea of the text. (三分钟后.板书并解释生词.要求掌握search, storm.) storm n. gravity n. search n./v. search for Step 2 Presentation 第二步 呈现

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