When you rewrite the paragraph, I advise you to leave out __________ is thought unnecessary or misleading.

A．what

B．that

C．those

D．which

下述除哪一项外，均为细菌生长繁殖的条件（）

A.酸碱度

B.营养物质

C.温度

D.气体环境

E.溶解度