液氮保存和复苏细胞的基本原则是
A．快冻快溶
B．慢冻慢溶
C．慢冻快溶
D．快冻慢溶
E．不必加冷冻保护剂
参考答案：C
选择与句中划线部分相同或相近的选项。
In fact , water makes up the largest part of the humans. [ ]
A. At fact
B. With fact
C. As a matter of fact
D. On fact
