题目内容
（请给出正确答案）
听力原文：M: How is the energy content of food measured？
W: It's measured in calories. The calorie is defined as the heat energy needed to raise the temperature of 1 kilogram of water from 14.5 degrees centigrade to 15.5 degrees centigrade.
Q: What does the woman define？
(16)
A．The kilogram.
B．The energy content.
C．Heat energy of water.
D．The calorie.
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