题目

There are various camps. Have you heard about ‘‘Survival Camp”? “Survival Camp” is for children to go into the lonely place for exciting activities. Now about 1,100 companies are allowed to take children into the great outdoors without their parents. The reason why people like “Survival Camp” is that they think getting close to nature is good for children. Many children in big cities spend all time watching TV and playing computer games. “Survival Camp” gives them an important change. Is “Survival Camp” a wonderful idea? Maybe it is. Children need more free time to下列有关固定化酶和固定化细胞的说法，正确的是   A．某种固定化酶的优势在于能催化一系列生化反应   B．固定化细胞技术只能固定一种酶   C．固定化酶和固定化细胞都能反复使用，但酶的活性迅速下降   D．固定化细胞常用包埋法，固定化酶常用物理吸附法