What does the passage mainly discuss? What regular service did The Associated Press and United Press International begin to of

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问题  What does the passage mainly discuss?
  What regular service did The Associated Press and United Press International begin to offer subscribing newspapers in the 1930’s?

选项 A、A new system of weather forecasting
B、An air-mass analysis
C、Twice daily weather maps
D、Cloud-cover photographs

答案B

解析
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