题目

世界上华人和华侨分布最集中的地区是（     ） Ａ、西欧          Ｂ、北美           Ｃ、东南亚         Ｄ、南美 答案：       CMuch new high technology has been introduced from America, ________ a great increase in the production of the company.        A. resulting in            B. having led to                 C. contributed to          D. caused