阅读短文，回答问题  
积淀，成就人生的高度
①我国南方湘粤一带有一种毛竹，漫山遍野，质地平凡而拙朴，在它一生最初的五年里，确实很平庸，几乎察觉不到它在生长。在别的竹类争先恐后攀比高度时，毛竹似乎不动声色。但是，当第六个雨季到来时，毛竹终于钻出地面，而后像施了魔法一样，以每天60厘米的速度生长，迅速达到30米的高度，在六个星期内就完成了它一生所要达到的高度，并把它的同类远远地甩在身后，创造了属于自己的神话。为什么会有这样的结果呢？寻本溯源，毛竹最后的快速生长，所依赖的就是前五年的日积月累，它以一种不易被人发觉的方式向地下生根，在五年的时间内伸展出长达几公里的根系。积微成著，蓄势后发，才造就了毛竹的一柱擎天。
②黄山松坚韧傲然，美丽奇特，但生长的环境却十分艰苦，因而生长速度异常缓慢，一棵高不盈丈的黄山松，往往树龄上百年，甚至数百年，根部却常比树干长几倍、几十倍，而正是由于黄山松的根扎得很深，能够汲取岩石深处的养分，才能够坚强立于岩石之上，虽经历风霜雨雪却依然永葆青春。
③毛竹在蓄势后的“魔法生长”，黄山松在风雨中的“气定神闲”，都源于基础的深厚、稳固。正是在无声中积聚了破土而出的力量，才有了毛竹喷薄而出的奇迹，才有了黄山松悬崖峭壁上的从容。
④人生又何尝不是如此？如果我们在逆境中也能沉下气来，不被困难吓倒；在喧嚣中也能定下心来，不被浮华迷惑；专心致志积聚力量，也会实现自身的飞跃，成就辉煌的人生。
⑤十九世纪，一个美国男孩靠在火车上卖报纸和雪茄烟为生，可是当旅客们谈起有关投资方面的事情时，他总会全神贯注地听着，他梦想成为一个能预测未来的交易商。为了这个梦想，他长大后整天躲在狭小的地下室里，将数万根的K线一根根画到纸上，并对着这些K线静静地思索、潜心地研究。后来他干脆把美国证券市场有史以来的记录搜集到一起，在那些杂乱无章的数据中寻找规律。整整六年，他集中研究了美国证券市场的走势与古老数学、几何学和星象学的关系，终于发现了有关证券市场发展趋势的最重要的预测方法，命名为“控制时间因素”。于是，他在金融投资生涯中赚取了五亿美元，创造的理论被译成十几种文字，他就是威廉·江恩——世界证券行业尽人皆知的最重要的“波浪理论”的创始人。
⑥其实，生命是一个创造的过程，也是一个积淀的过程，每个人无时无刻不在为自己的人生埋下“伏笔”。在平凡的生活中，我们只有尽可能地积聚力量，不断坚实人生基础，才会在最恰当的时机，散发出耀眼的光芒，顺利地攀登上人生的新高度。

依次填入下面一段横线处的语句最恰当的句子是（    ）

    人类并非像想象的那样脆弱，紧张的确是生活中不可缺少的部分。____________。生活在战争期间的人，发病率明显低于生活在和平环境中的人。这是由于人们在战争环境中精神紧张、生活积极、进取心强，所以长期充满活力，抗病能力也随之增强。

    We all know the feeling: looking at the computer screen, pretending to be interested in our homework, even though we really feel bored. But such feelings may soon be at an end, says Dr. Harry Witchel, head of the Essex Medical School. He believes that computers of the future will notice when people feel bored and even take action to stopit.

    Before you get concerned, the machine won't be reading your mind. It will be observing the many movements you make while using a computer. It's not interested in the big movements needed to use the machine — like moving a mouse or touching a screen — but small, barely noticeable movements like closing your eyes, moving in your seat or rubbing your face. Witchel calls these “boredom movements" and says they show how interested the person is in what they are reading or watching. The higher the interest level, the less movement!

    To test his theory, Witchel invited 27 people to perform various computer-based tasks. The activities ranged from playing online games (an interesting task) to reading documents like government laws that most people would find boring.

A special video camera followed the participants' movements as they completed each task. Just as the researcher expected, the “boredom movements" greatly decreased, by as much as 42%，when the subjects were very interested in what they were reading or seeing.

    Fortunately, Dr Witchel isn't planning to use his results to create machines that report students who are not paying attention at school. Instead, he wants “movement sensing” technology to be built into future computers in order to improve students' computer-based learning experience.

    The scientist says that by measuring the students' interest level as they work, educators will be able to adjust their materials in real-time to keep students focused. Witchel also believes that the technology can provide filmmakers with honest audience opinions and in the future, help to develop more intelligent robots.

如图所示，直线A为电源的U﹣I图线，直线B为电阻R的U﹣I图线，用该电源与R组成闭合电路时，则（   ）