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How long does it take to heat milk?

My sister Mary is only eight years old. We have milk for breakfast every morning.
One morning Mother said to Mary "Take a bottle of milk, put it into hot water, and keep it there for five minutes.
Five minutes is enough" At breakfast, Mary brought the milk. It was too hot for us to drink "Mary" said mother. "why is the milk so hot?
I told you that five minutes was enough to make a bottle of milk hot, didn't I ?
"But Mother" said Mary "there were three bottles of milk.
So I've kept the milk in hot water for a quarter of an hour"

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*bottle º´
*too hot for us to drink ³Ê¹« ¶ß°Å¿ö¼­ ¿ì¸®°¡ ¸¶½Ç ¼ö ¾ø¾ú´Ù.
*quarter 4ºÐÀÇ 1, 15ºÐ
*make a bottle of milk hot º´¿¡ µç ¿ìÀ¯¸¦ µû¶æÇÏ°Ô µ¥¿ì´Ù.

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