单选题
1分
SEVERE TROPICAL STORM UPGRADED INTO A TYPHOON AND AT 1800Z 13 AUGUST IT WAS ESTIMATED BASED ON SURFA...
SEVERE TROPICAL STORM UPGRADED INTO A TYPHOON AND AT 1800Z 13 AUGUST IT WAS ESTIMATED BASED ON SURFACE REPORTS. This phrase is likely to be under the heading of ______.
参考答案: D