Look at this desk. It's Jim's desk. It's brown. Jim's book is on it. The book is his English book. His pencil-box is on it, too. His pencil is in his pencil-box. But where's his pen? He can't find(找到) it.
请将下面一句话正确、端正、整洁地抄写在田字格内,标点要占格。
少壮不努力,老大徒伤悲。
已知函数f(x)=2a-1x+ax<2logax-1x≥2是R上的减函数,则实数a的取值范围是( )