The AP estimated the speed of the train by______.

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问题 The AP estimated the speed of the train by______.
  
Here is a searing piece of video and some remarkable journalism as a train derails horribly in Spain, killing at least 78 people. The Associated Press took the video and went to work. A video producer advanced it frame by frame.(25)The AP used a time stamp on the video to calculate the train’s speed. One estimate: 89 to 119 miles an hour: using a different technique, 96 to 112.(26)The posted speed limit is 50 miles an hour. In less than two hours, the AP went from video to story, providing vital information.

选项 A、50 miles an hour.
B、89 miles an hour.
C、96 miles an hour.
D、112 miles an hour.

答案A

解析
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