真核rRNA的转录后加工
A．切除部分肽链B．3’末端加-CCAC．3’未端加polyAD．45SrRNA的剪切E．亚单位的聚合
参考答案：D
Three girls ____________ collecting stamps.[ ]
A. like
B. likes
C. liking
There isn't _____ airport near where I live. _____ nearest airport is 110 kilometers away. [ ]
A. a; The
B. an; /
C an; The
D. a; /
