已知函数f（x）满足f（x）=x²﹣2（a+2）x+a²，g（x）=﹣x²+2（a﹣2）x﹣a²+8．设H₁（x）=max{f（x），g（x）}，H₂（x）=min{f（x），g（x）}（max（p，q）表示p，q中的较大值，min（p，q）表示p，q中的较小值），记H₁（x）的最小值为A，H₂（x）的最大值为B，则A﹣B=（　　）

    We all love college reunion(再聚). I feel very lucky to have been able to 1my 25th anniversary reunion. The meals were2welcomed. The celebration was inspiring,3 an overview of the past years. And the 4of my four years on campus were satisfying and5.

    One of my favourite parts was 6about the lives of my classmates. Their7lives-families, relationships-and also their professional work. There's the classmate who is an organic farmer and a leader in the effort to 8 other farmers about organic farming skills; the classmate who9over her family's power plant; the classmate who 10her own company; the classmate who went to a(n)11school and now works as a delivery nurse. All are inspirational. What they also 12 is a commitment to learning, leading, challenging and contributing, all things we learned the value of in college.

    Then there is our classmate who passed away in January 2017. He shared the commitment to all the 13listed above, as well as to the value of adventure and positive thinking. He was missed14 words. As a class, we 15him on Saturday evening and as a college, we did honor to him, along with other classmates who have passed away in the past five years, at a memorial service on Sunday morning. I was honored, on16 of our class and our college, to read his name and 17a candle for him at the service. This classmate was an18throughout his short life.

    I have been 19 on my 25th reunion and on my college days and all the days since. I am 20for the lessons I have learned so far. And I am inspired.

把24根小棒平均分给2个小朋友。