单选题 In the morning of November 18, 1755, an earthquake shook Boston. John Winthrop, a professor at Harvard College, felt the quake and woke up. "I rose," he wrote, "and lit a candle, looked at my watch, and found it to be 15 minutes after four." John Winthrop went 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 table 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 shocked 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.

单选题 The earthquake began ______.

单选题 Choose the right order of the events given in the passage.
a. He found a key on the floor.
b. He felt he was shaking.
c. He found it was eleven past four by the clock.
d. Winthrop went to bed at ten.
e. He found it was a quarter past four by his watch.
f. He knew there was an earthquake in Canada.

单选题 The passage suggests that ______.

单选题 The passage proves that ______.