已知函数f（x）=cosx，a，b，c分别为△ABC的内角A，B，C所对的边，且3a²+3b²﹣c²=4ab，则下列不等式一定成立的是（　　）

       ⑴我们谁都知道自己难免一死。但是这一天的到来，似乎遥遥无期。当然，人们要是健康无恙，谁又会想到它，谁又会整日惦记着它。于是便饱食终日，无所事事。

       ⑵有时我想，要是人们把活着的每一天都看作生命的最后一天该有多好啊！这就能更显出生命的价值。如果以为生命还比较漫长，我们的每一天就不会过得那样有意义，有朝气，我们对生活就不会总是充满热情。

       ⑶我们对待生命如此倦怠，在对待自己的各种天赋及使用自己的器官上又何尝不是如此？只有那些聋了的人才更加珍惜光明。那些成年后失明、失聪的人更是如此。然而，那些耳聪目明的正常人却不好好地去利用他们的天赋。他们视而不见、充耳不闻，无任何鉴赏之心。事情往往就是这样，一旦失去了的东西，人们才会留恋它，人得了病对会想到健康的幸福。

       ⑷我有过这样的想法，如果让每一个人在他成年后的某个阶段瞎上几天，聋上几天该有多好。黑暗将使他们更加珍惜光明；寂寞将教会他们真正领略喧哗的欢乐。

       ⑸最近一位朋友来看我，他刚从林中散步回来。我问他看到些什么，他说没有什么特别的东西。要不是我早习惯了这样的回答，我真会大吃一惊。我终于体会到了这样一个道理：明眼人往往熟视无睹。

       ⑹我多么希望看看这世界上的一切，如果说凭我的触觉能得到如此大的乐趣，那么能让我亲眼看一下该有多好。奇怪的是明眼人对这一切却如此冷漠！那点缀世界的五彩缤纷和千姿百态在他们看来是那么平庸。也许人就是这样，有了的东西不知道欣赏，没有的东西一味追求。在明眼人的世界上，视力这种天赋不过增添一点方便罢了，并没有赋予他们的生活更多的意义。

       ⑺假如我是一位大学校长，我要设一门必修课程：“如何使用你的眼睛”。教授应该让他的学生知道看清他们面前一闪而过的东西会给他们的生活带来多大的乐趣，从而唤醒人们那麻木、呆滞的心灵。

       ⑻请你思考一下这个问题：假如你只有三天光明，你将如何使用你的眼睛？想到三天以后，太阳再也不会在你的眼前升起，你又将如何度这那宝贵的三日？你又会让你的眼睛停留在何处。

                                                                                                                                                                                            ——（美）海伦·凯勒

下图Ⅰ、Ⅱ是某雌雄异体的高等动物体内两细胞分裂示意图。有关叙述错误的是（   ）

     As a young man, Tom was a famous artist with a wife and two fine sons. One night, his older son was ill. Tom and his wife thought it was nothing serious. But the boy died suddenly that night..

    After his son died, Tom always felt very sad. To make matters worse, his wife also left him later, leaving him alone with his six-year-old younger son, Emie. Sadly, he turned to alcohol(酒) for help.

    As time went by, Tom began to lose everything he had——his land, house, etc. A few months later, Tom passed away alone in a small bar. Hearing of Tom's death, I thought,“What a complete failure!”

   But later, I began to change my earlier opinion. I knew Tom's now adult son, Emie. He is one of the kindest, most caring men. I saw the love between Emie and his children. And I thought that kindness and caring had to come from somewhere.

    One day, I asked him what made him become such a specia1 person. Emie said quietly, “My father came into my room every night, give me a kiss and said,“love you, son.”

     Hearing his words, I understood everything. Tom didn't leave many things behind. But he had been a kind loving father, and left behind his best love.