任取x₁，x₂∈a，b，且x₁≠x₂，若$f\left(\frac{x_1+x_2}{2}\right)>\frac{1}{2}f\left(x_1\right)+f\left(x_2\right)$，称f（x）是a，b上的凸函数，则下列图象中，是凸函数图象的是（　　）

    I like sports very much. Last weak, I took part in the school basketball match. It was so____（令人愉快的).The fans____ (为...加油 )us on and we played____(好的) than usual so we won the match. Our teacher was very____(满意的)with us and we took photosinthe____(体育馆)。

    Doing sports is a good____(选 择 )to keep fit. There are____大 量 )of sports for us to choose. Some of my ____( 同学)like playing volleyball and others like playing baseball .For me, basketball is my favourite.

    Let's do sports now. It makes us have more____(机会) of making fiends. What's more, the more you do sports, the____(健康的) you will be.

最大的两位数是____，和它相邻的两个数分别是____和____．