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  3. On the morning of November 18,1735, an earthquake shook Boston, Massachusetts. John Winthrop, a professor at Harvard College, fe

On the morning of November 18,1735, an earthquake shook Boston, Massachusetts. John Winthrop, a professor at Harvard College, fe

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问题     On the morning of November 18,1735, an earthquake shook Boston, Massachusetts. John Winthrop, a professor at Harvard College, felt the quake and awoke. "I rose," Winthrop wrote, "and lighting a candle, looked on my watch, and found it to be 15 minutes after four." John Winthrop walked quickly downstairs to the grandfather’s clock. It had stopped three minutes before, at 4 ’ 11. Except for stopping the clock, the quake had only thrown a key from the mantel to the floor.
    The clock had stopped because Winthrop had put some long glass tubes he was using for an experiment into the box for safekeeping.  The quake had knocked the tubes over and blocked the pendulum. Winthrop, therefore, had the exact time that the earthquake had hit Boston. He looked at the key on the floor. The quake had thrown it forward in the direction of the quake’s motion by a shock coming from the northwest, perhaps in Canada.  
This selection proves that ______.
选项 A、man is often unable to control the power of nature
B、earthquakes occur most often during nighttime hours
C、the direction of an earthquake can be detected (= discovered)
D、university study the cause of earthquakes
答案C
解析
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