题目

Another person’s enthusiasm was what set me moving toward the success I have achieved．That person was my stepmother． I was nine years old when she entered our home in rural Virginia．My father__1__me to her with these words: “I would like you to meet the fellow who is___2  for being the worst boy in this county and will probably start throwing rocks at you no ___3  than tomorrow morning．” My stepmother walked over to me, ___4  my head slightly upward, and looked me right in the eye．Then she looked at my father and replied, “You are ___5  ．This is not the worst boy at all已知函数，则的单调递减区间为（   ）A．[0，1） B．（-∞，0） C． D．（-∞，1）和（1，+∞）