一年に____ぐらいゆきがふりますか。
A．どこ
B．どの
C．どう
D．どんな
参考答案：B
带息单据贴现额的计算公式是什么？
The incidence of this disease has been greatly reduced thanks to our health care program.()
A. seriousness
B. frequency of occurrence
C. mortality
D. cure rate
