由糖水原理可知$$a\textless{}b\textless{}c$$． 
若$$a=\frac{2005\times 2006}{2007\times 2008}$$，$$b=\frac{2006\times 2007}{2008\times 2009}$$，$$c=\frac{2007\times 2008}{2009\times 2010}$$，则有（~ ）． 

* $$a\textgreater b\textgreater c$$ 
* $$a\textgreater c\textgreater b$$ 
* $$a\textless{}c\textless{}b$$ 
* $$a\textless{}b\textless{}c$$ 