The children are full of . They have been playing all day long without resting.
A. energy
B. power
C. force
D. strength
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(答案→)A. energy
B. power
C. force
D. strength
解析：词义辨析, energy主要指精力，能量。strength主要指力量，强度。power主要指动力，功率，电力。force主要指外力。根据题意这里指孩子们充满精力，故选A。