填入下面横线处的句子，与上下文衔接最恰当的一组是(    )
历史是对过去的记忆。米兰·昆德拉强调，对过去记忆的丧失，将使“人变得比大气还轻，会高高地飞起，离别大地亦即离别真实的生活。他将变得似真非真，运动自由而毫无意义”                 。
①但“知其不可而为之”
②虽然知道历史必然有大量“空白”因此有填不完的“空”
③这便是“生命中不能承受之轻”的原因所在
④而千千万万无辜的死难者，将被历史迅速遗忘，最多化为“历史教科书”上一小段无足轻重的文字或几个干瘪枯燥的数字
⑤摆脱历史记忆，生命将变得毫无意义
⑥尽量不让历史“留白”，尽可能为历史“填空”， 就更是历史学家，不，应是所有人的责任

读“西北地区略图”下列有关西北地区的描述，正确的是（　　）

    Once there was a piano player in a bar. People came just to hear him play. But one night, a girl asked him to sing a song.

    “I don't sing,” said the man.

    But the girl told the waiter, “I'm tired of listening to the piano. I want the player to sing! ”

    The waiter shouted across the room, “Hey, friend! If you want to get money, sing a song!”

    So he did. He had never sung in public before. Now he was singing for the very first time! Nobody had ever heard the song!

    He had skills(技能) he was sitting on! He may have lived the rest of his life as a no-name piano player in a no-name bar. But once he caught the chance, and found, by accident, that he could sing well, he went on working hard and became one of the best-known singers in the US. His name was Nat King Cole.

    You, too, have skills. You may not feel that your skills are great, but it may be better than you think. With hard work, most skills can be improved(提高).