1.D
2.A
3.B
All the shoes are (either)too big (or)too small for me .
Nobody runs ( more slowly )than he among all the boys.
far + adj /adv（太,很）-These days I keep a far too busy life.
far + 比较级（太,很）_She is far better than me at writing
已知关于X的方程X2(平方)+2(2-M)X+3-6M=0