选择培养基是 （）

A.KIA培养基

B.动力-吲哚-尿素（MIU）培养基

C.血清蛋白胨水

D.SS琼脂培养基

E.葡萄糖蛋白胨水培养基

____is well-known to all, the great changes have taken place in China.

A．It

B．that

C．As

D．Which