Much 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

全口义齿修复的目的是（）

A.恢复咀嚼功能

B.增强心理适应能力

C.改善发音

D.保护剩余牙槽嵴

E.恢复颜面高度