下列物质或细胞结构中，没有核糖参与组成的是[ ]
A．转运RNA
B．质粒
C．核糖体
D．ATP
答案：B
Teaching and learning _____ greatly from each other —they are two entirely different processes.
A．differ
B．disagree
C．compare
D．transform
何谓自身输血？有何优点？
