With the development of high technology, more and more new things _______ to the field of IT．

A．have introduced

B．are being introduced

C．were introduced

D．had been introduced

生化汤证的病机是（）

A.冲任虚寒，瘀血阻滞

B.产后血虚，寒凝血瘀

C.子宫虚冷，经脉不调

D.产后气滞，瘀血阻滞

E.气虚血瘀，经脉不通