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Directions: For this part, you are allowed 30 minutes to write an essay on the use of PowerPoint(PPT) in class. You should write at least 120 words but no more than 180 words. 岩石经过长期的风化剥离和流水侵蚀
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Online dictionaries are becoming increasingly popular. We can see lots of students consulting different online dictionaries in their computers or other portable digital devices instead of taking out a very cumbersome book and looking up a certain word in millions of vocabularies. What a fantastic age it is!
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