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问题 单项选择题

固定化细胞与固定化酶比较，其优点（）

A.保持胞内酶系的原始状态与天然环境

B.仅能用于产生胞内酶的菌体

C.细胞内多种酶的存在

D.使用初期会有一些细胞组分渗出

答案

参考答案：A

选择题

Brian is such an excellent scientist that we shouldn't be surprised if he________the Noble Prize one day.[ ]

A. is awarded  

B. had been awarded

C. have been awarded  

D. would have been awarded
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选择题

My mother is always warning me when I go out, "Don't get off the bus ________ it is stopping."[ ]

A. until  

B. before

C. while  

D. after
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