日照间距系数是建筑间距与前面遮挡的楼高比值d/h。长春需要（）左右。
参考答案：2.5
Many people agree that _____ knowledge of English is a must in _______ international trade today. [ ]
A. a; /
B. the; an
C. the; the
D. /; the
被称之为达尔文的斗犬的是历史上（）
