在风向频率玫瑰图中，某一方向的线段长度与图例中单位长度的比值表示该方向风的（）。
A.频率值
B.统计值
C.代表值
D.标准值
参考答案：A
加权移动平均中，一般而言，最近期的数据最能预示未来的情况，因而其权重应大些。
As is known to all, the financial crisis firstly broke out in the United States which
_____ the group of developed countries. [ ]
A. belonging to
B. was belonging to
C. belongs to
D. is belonged to
