细菌和酵母菌在结构上的重要区别是[ ]
A.前者有液泡,后者无液泡
B.后者比前者高尔基体多
C.前者无成形的细胞核,后者有细胞核
D.前者比后者核糖体多
答案:C
_____ in the country, we had few social activities. [ ]
A. Living
B. Being lived
C. Having lived
D. Having been lived
在长度为n的线性表中,寻找最大项至少需要比较()次。
A.1
B.2
C.3
D.4