On the morning of November 18, 1755, an earthquake shock Boston John Winthrop, a professo

On the morning of November 18, 1755, an earthquake shock Boston． John Winthrop, a professor at Harvard College, felt the quake and awoke. “I rose”, Winthrop wrote, “and lighted a candle, looked at my watch, and found it to be 15minutes after four.” John Winthrop hurried downstairs to the grandfather clock．It had stopped three minutes before, at 4:12．Except for stopping the clock, the quake had only thrown a key from the mantel（壁炉台）to the floor．
The clock had stopped because Winthrop had put some long glass tubes he was using for an experiment into the case for safekeeping． The quake had knocked the tubes over and blocked the pendulum（钟摆）．Winthrop, therefore, had the key on the floor． The quake had thrown it forward in the direction of the quake’s motion by a shock ing from the northwest, perhaps in Canada．
【小题1】What does “it” in the second paragraph refer to?A．the floorB．the keyC．the clockD．the case【小题2】The text suggests that    ．A．earthquakes are mon in BostonB．John Winthrop was a scientistC．John Winthrop often had difficulty in sleepingD．Harvard College was a center for earthquake researching【小题3】Which of the following is true?     .A．Some tubes were broken into pieces and stopped the old clockB．The professor lit a candle because of power failureC．Boston is in the southeast of CanadaD．The shocks were slight in one way【小题4】John Winthrop put some tubes into this clock case because     ． A．he wanted to do an experimentB．he thought an earthquake was probably to happen soonC．he thought it safe for them to be put thereD．he wanted to record the exam time of the earthquake．B