求原文.我做首字母填空.开头是Many countries have studied space for more than fifty years.没答案的啊????
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![求原文.我做首字母填空.开头是Many countries have studied space for more than fifty years.没答案的啊????](/uploads/image/z/9163720-64-0.jpg?t=%E6%B1%82%E5%8E%9F%E6%96%87.%E6%88%91%E5%81%9A%E9%A6%96%E5%AD%97%E6%AF%8D%E5%A1%AB%E7%A9%BA.%E5%BC%80%E5%A4%B4%E6%98%AFMany+countries+have+studied+space+for+more+than+fifty+years.%E6%B2%A1%E7%AD%94%E6%A1%88%E7%9A%84%E5%95%8A%EF%BC%9F%EF%BC%9F%EF%BC%9F%EF%BC%9F)
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