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Общий вопрос - is the aetiology of cancer unknown?
Альтернативный вопрос - is the aetiology of cancer known or unknown?
1 специальный - Why is the unknown aetiology of cancer?
2 специальный - When the aetiology of cancer is known?
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Ответ:
Объяснение:
Общий вопрос - is the aetiology of cancer unknown?
Альтернативный вопрос - is the aetiology of cancer known or unknown?
1 специальный - Why is the unknown aetiology of cancer?
2 специальный - When the aetiology of cancer is known?