题目

My mother used to ask me what is the most important part of the body. Through the years I would  21  what I thought was the correct answer. When I was younger, I thought   22  was very important to us as humans, so I said, My ears, Mommy.  She said, No. Many people are   23  . But you keep thinking about it and I will ask you again soon. Several years passed   24   she asked me again. Since making my first   25  , I had often thought of the correct answer. So this time I told her, Mommy, sight is very important to everybody, so it must be our eyes. She looked at me and选修4-5：不等式选讲已知函数，.（1）解不等式；（2）若对任意的，都有，使得成立，求实数的取值范围.