Much new and high technology has been introduced from America, thus ____ great increase in production

of the company. [ ]

A. resulting in

B. resulted in

C. resulting from

D. resulted from

从空树起，依次插入关键字37,50,42,18,48,12,56,30,23，构造一棵二叉排序树。
(1)画出该二叉排序树；
(2)画出从(1)所得树中删除关键字为37的结点之后的二叉排序树。