What does the passage mainly discuss? According to the passage, one important reason why newspapers printed daily weather maps

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问题  What does the passage mainly discuss?
  According to the passage, one important reason why newspapers printed daily weather maps during the first half of the twentieth century was

选项 A、the progress in printing technology
B、a growing interest in air transportation
C、a change in atmospheric conditions
D、the improvement of weather forecasting techniques

答案B

解析
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