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Level 25
出版Thomson Learning Australia, 2007
ISBN01701271769780170127172
URLhttp://books.google.com.hk/books?id=oWtujwEACAAJ&hl=&source=gbs_api
註釋The Great Wall of China is the longest man-made structure on Earth. The wall was originally built as a form of defence to keep invaders out. But today millions of tourists are welcomed to China to visit the Great Wall.