— Are you sure we can eat this with our hands? 

—  Why not ? All of these people eat this way.  You know, ______ .[ ]

A. many hands make light work

B. when in Rome , do as the Romans do

C. Rome wasn't built in a day

D. All roads lead to Rome 

在DNA和RNA分子中

A．核糖和碱基都相同

B．核糖和碱基都不同

C．核糖不同而碱基相同

D．核糖相同而碱基不相同

E．核糖不同而部分碱基相同