DNA双螺旋中嘌呤/嘧啶的比值为1。 ( )
参考答案:对
My bike needs _____. I think I need _____ to ask Uncle Wang for help. [ ]
A. repairing; going
B. repairing; to go
C. to repair; going
D. to repair; to go
评述古代希腊、罗马政治制度并比较异同。