At three a.m., Jack Mills was sitting at the controls of the mail train. The train was made up of 13 cars. At the end of the train, 71 mailmen sat sorting the mail. Inside the second car, there were only five mailmen and 128 bags full of five-pound notes. This train had run more than 100 years without being robbed(抢劫). At three minutes past three, Mills and his helper, David Whitby, saw a yellow warning light. They slowed the train, and then stopped. Whitby went to the telephone beside the track. It was out of order. Then he saw a man moving between the second and the third cars. Before Whitby could give a warning, he was knocked down by two men. Mills’ cars with all the mailmen had been disconnected by the robbers. At the bridge, the bags of money were unloaded from the train and thrown into waiting trucks. One of the robbers who obviously knew the schedules(时刻表) of all the trains kept looking at his watch. At 3:45 he said, “That will have to be enough.” The robbers drove away with more than 2,500,000 pounds.
41. The robbery took place______.
A. before 3:03 B. in the early morning
C. after three o’clock in the afternoon D. after 3:45
42. The robbers_____ before the train stopped.
A. were all in the train B. forced Mills to stop the train
C. were waiting for the train to stop D. ordered Mills to go on driving
43. Why didn’t the other mailmen help the mailmen in the second car when the robbery happened?
A. Because they were busy sorting the mail.
B. Because they didn’t want to help the mailmen in the second car.
C. Because the last eleven cars were separated from the front cars.
D. Because they knew nothing about the robbery.
44. One of the robbers kept looking at his watch because________.
A. he wanted to know the exact time B. he enjoyed looking at his watch
C. he didn’t know when another train would come
D. they had to leave before another train came
45. Which of the following is NOT true?
A. The train was out of order.
B. The telephone was put out of order by the robbers
C. Whitby had an assistant driver.
D. The robbers carried the money away by truck.
sin100πtV的交流电源，副线圈接一个R=27.5Ω的负载电阻．则下述结论正确的是（ ）
W
