高效液相色谱法中的化学衍生化根据是否与高效液相系统联机来划分，可分为柱前衍生化和柱后衍生化两种。

A．He gives up almost everything he has, even his will to live
B．He contributes his own bit although he is caught in an uncontrollable force
C．He is an invalid leading a life of recluse
D．He has lost his mother to the war

A．正确
B．错误