---At the school sports meeting, many students are full of________, but I’m always exhausted.
---You’d better take more exerciseA.strengthB.forceC.energyD.power
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C解析试题分析：名词词义辨析。strength: the quality of being strong,力气，主要指“肌肉力量以及物体的承重力或抗拉力”。force: 指“能量的应用”即释放的能量及其冲击力。energy: being full of life and action,指“活力”。power: the ability to do things,指可供使用的能量，如意志力、影响力、控制力。题意：“许多学生精力充沛，而我总是精疲力竭”。full of energy（充满活力）与后文exhausted（精疲力竭的）相对。所以选项C正确。
考点：近义词辨析。