某班第一小组6名女生在测仰卧起坐时，记录下她们的成绩（单位：个/分）：45，48，46，50，50，49．这组数据的平均数是（　　）

阅读下文，回答相关问题

                                                                                爱与孤独
      ①爱和孤独是人生最美丽的两支曲子，两者缺一不可。没有爱的心灵会孤独，未曾体味过孤独的人也不可能懂得爱。由于怀着爱的希望，孤独才是可以忍受的，甚至是甜蜜的。
      ②不止—位先贤指出，—个人无论看到怎样的美景奇观，如果他没有机会向人讲述，他就决不会感到快乐。人终究是离不开同类的。一个无人分享的快乐绝非真正的快乐，而一个无人分担的痛苦则是最可怕的痛苦。所谓分享和分担，未必要有人在场。但至少要有人知道。永远没有人知道，绝对的孤独，痛苦便会成为绝望，而快乐——同样也会变成绝望！
      ③交往为人性所必需，人生之常态，而它的分寸却不好掌握。帕斯卡尔说：“我们由于交往而形成了精神和感情，但我们也由于交往而败坏着精神和感情。”我相信，前—种交往是两个人之间的心灵沟通，它是马丁•布伯所说的那种“我与你”的相遇，既充满爱，又尊重孤独；相反，后一种交往则是熙熙攘攘的利害交易，它如同尼采所形容的“市场”，既亵渎了爱，又羞辱了孤独。相遇是人生莫大的幸运，在此时刻。两颗灵魂仿佛同时认出了对方，惊喜地喊出：“是你！”人一生中只要有过这个时刻，爱和孤独便都有了着落。

   Grandma was always forgetting things." What's wrong with her?" Anna asked. "We think she's getting old, and she may be ill. We may have to send her to a nursing home so that she can be taken good care of. But we can go to see her and bring her presents, like strawberry ice cream." Mother said.
   One day, they went to see Grandma at the nursing home. Anna hugged(拥抱) Grandma. "Look," she said, "we've brought you strawberry ice cream!" Grandma didn't say anything. She just took it and began eating. "Do you know who I am?" Anna asked. "You're the girl who brings me ice cream." Grandma said.  "Yes, but I'm Anna, your granddaughter. Don't you remember me?" she asked, throwing her arms around the old lady. Grandma smiled, "Remember? Sure. You're the girl who brings me ice cream." Suddenly Anna realized that Grandma would never remember her. "Oh, how I love you, Grandma!" she said. Just then she saw a tear roll down Grandma's cheeks (脸颊). "Love," she said, "I remember love. n "You see, dear, that's what she wants—love!" Mother said. It's more important to remember love than someone's name.