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在线学习任务 Online Learning Tasks：
1)Read through the text and understand the speech and its theme
2)Grasp the key words and expressions used in the text
3)Finish all the exercises related to the text
线下学习任务 Off-line Learning Tasks：
1)Recite the new words and expressions in the text
2)Review the text again and memorize paragraphs 59-60 in the text
3)Try to describe the changes Obama aims to make if elected .
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