已知点A(2,3),B(－3,－2).若直线$l$过点P(1,1)且与线段AB相交,则直线$l$的斜率k的取值范围是(    )

   Today Grandma comes for a visit. She gives my sister and me a box of chocolate candies. We say "thank you!"
   Then Jenny quickly takes off the box. The pieces all look the same! I can't tell which pieces are hard inside and which are soft! I only like the soft ones. Jenny does not care. She is happy to get any kind of candy!
   I slowly look at all the pieces; I don't know which one to choose. Just then Dad calls us Grandma is going home, He wants us to say goodbye to her. I hurry to the front door where they are standing. Jenny comes a few minutes later. I say, "Grandma, I hope to see you soon. I always feel sad when you leave. "Jenny stands behind me and doesn't say anything. After Grandma goes home, I find out why Jenny doesn't say anything.
   She has most of our candies in her mouth! Only a few pieces are left in the bottom of the box! Then I'm sad!

三个数$a=0.{31}^2,b={\log }_{2}0.31,c=2^{0,31}$之间的大小关系为（ ）