The house ________ I grew up has been taken down and replaced by an office building.

A．that

B．in that

C．which

D．in which

两个抗原完全不同时，双扩平板法的沉淀线出现（）

A.二条沉淀线相交叉

B.二条弧线完全融合

C.二条沉淀线平行

D.二条弧线不连接

E.二条弧线部分融合