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意大利科学家最近合成了新型的氧分子O₄，对其说法正确的是……………………（ ）

A．O₄是一种新型的化合物 B．O₄是一种混合物

C．O₄和O₃都是氧元素的单质 D．一个O₄分子含有2个O₂分子

c