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(单选题)What is puzzling about the airline pricing to the author? ( (单选题)According to the passage, prices are normally determined by (单选题)According to the passage, what happened in early 2014? ( (单选题)What’s the temperature when the report was written? ( ) (单选题)According to the National Weather Service ( ). (单选题)What was impossible during the early years of the industry? (单选题)What happened in the third era? ( ) (单选题)When did the PC industry start? ( ) (单选题)What can be inferred from the passage about next fall’s soyb (单选题)Why did the prices of soybean rise according to the passage?