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
All the students ______come from America are here.
A．who
B．which
C．/
D．that
Mr. Brown is warm-hearted and often does everything that he can to to those in trouble.
A．break out
B．set out
C．reach out
D．pick out
