题目内容：
已知反应：X+Y=M+N为放热反应，对该反应的下列说法正确的是（ ）
A该反应为放热反应，因此不必加热即可反应
BX能量一定高于M
CX和Y的总能量一定高于M和N的总能量
DY能量一定高于N
答案解析：
单选题：已知反应：X+Y=M+N为放热反应，对该反应的下列说法正确的是（ ） A该反应为放热反应，因此不必加热即可反应BX能量一定高于MCX和Y的总能量一定高于M和N的
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