生物传感膜是采用固定化技术制作的人工膜，与游离相比较其优点为（）

A.热稳定性提高

B.可重复使用

C.不需要在反应后进行催化物质与反应物质的分离

D.可以根据已知的半寿期确定生物膜的寿命

E.能够避免外源微生物的污染和降解

Life insurance, before available only to young, healthy persons, can now be obtained for quite a large proportion of the elderly population, and, sorry, even for pet animals.

A．before young, healthy persons available only,

B．available only to young, healthy persons before,

C．available only to persons young, but more healthy,

D．before young and healthy persons only available to,