选词完成句子，将字母代号填写在横线上。

A. pink    B. have   C. make    D. litter    E. hear

将同一成熟植物细胞依次浸入蒸馏水、0.3mol/L的蔗糖溶液和0.4mol/L的KNO₃溶液中，测得细胞的体积随时间的变化曲线如图所示，则曲线A、B、C分别代表细胞所处的溶液是（    ）

    Anne and Sue are good f____. They have the s____ age. They are both twenty-two. They both like sports. Most important, they both like new dresses. They usually go s____ together at weekends. Now they are in a c____ shop. There are d____ kinds of beautiful dresses. Anne wants a red dress. But Sue thinks the pink o____ is better.

下列函数中既是偶函数，又在区间$\left(0,+\infty \right)$上单调递增的函数是(     )

世界历史上第一个社会主义国家诞生的标志性事件是 ____。