Câu hỏi:
John was very tired after a long day of work. He went to bed at 10 p.m., wound his alarm clock and set it for noon the next day. Since John fell asleep almost immediately, how many hours of sleep did he get before the alarm woke him?
Đáp án:
Two hours. Wind-up clocks can't be set more than 12 hours in advance.
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