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Trắc nghiệm: Although this is far from certain. the _______ age of the universe is about 4.6 billion years,Although this is far from certain. the _______ age of the universe is about 4.6 billion years.

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Although this is far from certain. the _______ age of the universe is about 4.6 billion years, Although this is far from certain. the _______ age of the universe is about 4.6 billion years.

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