动物细胞培养必需溶液包括哪些
参考答案：
1平衡盐水（BBS）：生理盐水+葡萄糖
2培养基pH调整液
3细胞消化液
4抗生素溶液
__________, he had no money, but later he became quite rich.
A．To begin with
B．Beginning with
C．Begin with
D．Begun with
