She spent 25 dollars on the watch chain.It means ___.

A．she paid 25 dollars on the watch chain

B．the watch chain cost her 25 dollars

C．it took her 25 dollars buying the watch chain

D．she bought the watch chain of 25 dollars

发展最大力量有哪两种途径？作为高水平的散打运动员应首先以哪种途径发展最大力量？