1 . The___________ (add) of the Chang'an-Tianshan Corridor to the UNESCO World Heritage List is a milestone in recognition of the Silk Road as a crucial part of humanity's common heritage. (所给词的适当形式填空)
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2 . The addition of Chang’an-Tianshan Corridor __________ the UNESCO World Heritage List is a milestone in recognition of the Silk Road as a crucial part of humanity’s common heritage. (用适当的词填空)
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