在动物细胞培养过程中,下列处理不恰当的是( )
A:培养液和培养用具要进行无菌处理
B:培养基需添加动物血清、血浆等天然成分
C:提供纯氧以保证细胞的呼吸作用
D:保证提供适宜的温度和pH
选词填空。
square, somebody, about, freshwater
— The owner of the small shop fought to stop the big corporation from knocking it down.
— Yes, and he finally made it. It was indeed __________.