题目

阅读理解填词 先阅读短文，再在其后空白处写出各单词的正确形式。单词的第一个字母已给出。 Once my mother told me a story. In Africa, when an antelope(羚羊) wakes up every morning, the first thing it thinks about is, “I must be able to run faster than the fastest lion, or I will be killed.” At the same time, a lion wakes from his d 1   . The first thing the lion thinks about is, “I must be able to catch the s_2___ antelope, or I will die of h ___3___” So, almost at the same time, the antelope and the lion get up and start running toward t已知函数f（x）=x+ 的图象过点P（1，5）． （Ⅰ）求实数m的值，并证明函数f（x）是奇函数；（Ⅱ）利用单调性定义证明f（x）在区间[2，+∞）上是增函数．