题目

—Is it true that Aaron refused an offer from Cambridge University yesterday?—Yeah, but I have no idea _________ he did it; that's one of his favourite universities. A . when B . why C . that D . how 答案：B下列关于城市等级与服务范围大小的关系的说法，正确的是（   ） A．城市等级越低，数目越多，服务范围越小 B．城市等级越高，数目越多，服务范围越大 C．城市等级越高，数目越少，服务范围越小 D．城市等级越低，数目越少，服务范围越大