Xbox also revealed on Friday that Matt Booty - who previously worked under Spencer as corporate vice president of Xbox Game Studios - had been promoted to chief content officer.
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Cooper rejects the view that this slot-machine version of entertainment saps our ability to focus.
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（六）放射性同位素，是指化学元素中具有相同原子序数，但质量不同且能发生放射性衰变的核素。