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英语(成人高等教育)
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This book is the product of several years of___n two leading universities. ）
答：collaboration
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1
Some people believe that the earth can ______ enough food to support at least twice its present population. (produce crops,profits,etc.)
2
Meeting package____________
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澳大利亚一定很有趣!
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私家旧货出售____________
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Some of the tunnels in the cliff are natural, some were _______ out.
