Ⅳ.短文改错
(·青海师大附中月考)
In the morning of November 18th, 1755, an earthquake shook Boston. John, professor in Harvard college felt a quake and woke up and found to be fifteen minutes past four. He hurried to downstairs to the clock. It had stopped three minutes ago. Except to stopping the clock, the quake had only thrown a key from the mantel (壁炉架)to the floor. The clock had stopped because John put some long glass tube he was using for an experiment into the case for safekeeping. The quake had been knocked the tubes over and blocked the pendulum(钟摆). So John had the exactly time of the earthquake.