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日期:2020-08-05 02:59:51

1.   Inasmuch as peculiarities often appear under domestication in one sex and become hereditarily attached to that sex, the same fact probably occurs under nature, and if so, natural selection will be able to modify one sex in its functional relations to the other sex, or in relation to wholly different habits of life in the two sexes, as is sometimes the case with insects. And this leads me to say a few words on what I call Sexual Selection. This depends, not on a struggle for existence, but on a struggle between the males for possession of the females; the result is not death to the unsuccessful competitor, but few or no offspring. Sexual selection is, therefore, less rigorous than natural selection. Generally, the most vigorous males, those which are best fitted for their places in nature, will leave most progeny. But in many cases, victory will depend not on general vigour, but on having special weapons, confined to the male sex. A hornless stag or spurless cock would have a poor chance of leaving offspring. Sexual selection by always allowing the victor to breed might surely give indomitable courage, length to the spur, and strength to the wing to strike in the spurred leg, as well as the brutal cock-fighter, who knows well that he can improve his breed by careful selection of the best cocks. How low in the scale of nature this law of battle descends, I know not; male alligators have been described as fighting, bellowing, and whirling round, like Indians in a war-dance, for the possession of the females; male salmons have been seen fighting all day long; male stag-beetles often bear wounds from the huge mandibles of other males. The war is, perhaps, severest between the males of polygamous animals, and these seem oftenest provided with special weapons. The males of carnivorous animals are already well armed; though to them and to others, special means of defence may be given through means of sexual selection, as the mane to the lion, the shoulder-pad to the boar, and the hooked jaw to the male salmon; for the shield may be as important for victory, as the sword or spear.Amongst birds, the contest is often of a more peaceful character. All those who have attended to the subject, believe that there is the severest rivalry between the males of many species to attract by singing the females. The rock-thrush of Guiana, birds of paradise, and some others, congregate; and successive males display their gorgeous plumage and perform strange antics before the females, which standing by as spectators, at last choose the most attractive partner. Those who have closely attended to birds in confinement well know that they often take individual preferences and dislikes: thus Sir R. Heron has described how one pied peacock was eminently attractive to all his hen birds. It may appear childish to attribute any effect to such apparently weak means: I cannot here enter on the details necessary to support this view; but if man can in a short time give elegant carriage and beauty to his bantams, according to his standard of beauty, I can see no good reason to doubt that female birds, by selecting, during thousands of generations, the most melodious or beautiful males, according to their standard of beauty, might produce a marked effect. I strongly suspect that some well-known laws with respect to the plumage of male and female birds, in comparison with the plumage of the young, can be explained on the view of plumage having been chiefly modified by sexual selection, acting when the birds have come to the breeding age or during the breeding season; the modifications thus produced being inherited at corresponding ages or seasons, either by the males alone, or by the males and females; but I have not space here to enter on this subject.Thus it is, as I believe, that when the males and females of any animal have the same general habits of life, but differ in structure, colour, or ornament, such differences have been mainly caused by sexual selection; that is, individual males have had, in successive generations, some slight advantage over other males, in their weapons, means of defence, or charms; and have transmitted these advantages to their male offspring. Yet, I would not wish to attribute all such sexual differences to this agency: for we see peculiarities arising and becoming attached to the male sex in our domestic animals (as the wattle in male carriers, horn-like protuberances in the cocks of certain fowls, &c.), which we cannot believe to be either useful to the males in battle, or attractive to the females. We see analogous cases under nature, for instance, the tuft of hair on the breast of the turkey-cock, which can hardly be either useful or ornamental to this bird; indeed, had the tuft appeared under domestication, it would have been called a monstrosity.
2.   I fain would know it.
3.   `Oh, I don't think it's hardly my place. I don't think Sir Clifford would like it at all, my Lady.'
4.   "Where is their road?"
5. 在这一情形下,华兴源创将如何减小业务集中所带来的风险?其在面板检测领域的高增长究竟能否延伸至其他行业?面板检测营收增长显著在面板检测这一领域,华兴源创的优势集中在对LCD和OLED两类屏幕的检测。
6. 在工资和工作日已定时,一个可变资本,例如100,代表着一定数目的被推动的工人;它就是这个人数的指数。例如,假定100镑是100个工人一周的工资。如果这100个工人所完成的必要劳动和剩余劳动一样多,也就是说,如果他们每天为自己劳动的时间,即再生产他们的工资的时间,和他们为资本家劳动的时间,即生产剩余价值的时间一样多,那末,他们的总价值产品就=200镑,他们生产的剩余价值则是100镑。剩余价值率m/v就=100%。但是我们已经知道,这个剩余价值率由于不变资本c的大小不等,从而由于总资本C的大小不等,会表现为极不相同的利润率,因为利润率=m/C。假定剩余价值率为100%:


1. 但不排除既存的药物有治疗效果。
2. 据了解,此事件事发于乐山市人民医院,目前双方已经共同封存涉事输液袋。
3. 从有关报道中可知,1996年6月25日,太康县检察院将谢哲海案退回给公安部门补充侦查,理由就是事实不清,证据不足。
4. 民警让老路自己用铲子将血迹收集。
5.   "Some years ago-to be definite, in May, 1884-there came to Lee agentleman, Neville St. Clair by name, who appeared to have plenty ofmoney. He took a large Villa, laid out the grounds very nicely, andlived generally in good style. By degrees he made friends in theneighbourhood, and in 1887 he married the daughter of a localbrewer, by whom he now has two children. He had no occupation, but wasinterested in several companies and went into town as a rule in themorning, returning by the 5:14 from Cannon Street every night. Mr. St.Clair is now thirty seven years of age, is a man of temperatehabits, a good husband, a very affectionate father, and a man who ispopular with all who know him. I may add that his whole debts at thepresent moment, as far as we have been able to ascertain, amount toL88 10s., while he has L220 standing to his credit in the Capitaland Counties Bank. There is no reason, therefore, to think thatmoney troubles have been weighing upon his mind.
6. 中国互联网招聘市场在宏观经济环境的影响下,整体规模增速有所放缓。


1. 2月2日开始,他一跑动起来就觉得心脏剧烈跳动,后腰疼得钻心。
2. 金店长举例,其这个月只碰到了一位亚洲城的业主,低于市场价30万元出售了自己的房源。
3. TerracottaInvestments并不相信他们能够做到这一点,因为这些品牌很可能只是试用宝尊的服务一年,然后便离开。
5. 派去的人回来了,报告说,大路上都已埋设了地雷,在跨越陡峭的峡谷的吊桥上有警卫把守,但只有15人,尽管那次失败的滑翔机攻击已经敲响了先期警报。工厂的墙上装有探照灯并有机枪卫护。
6.   The said Eliza, John, and Georgiana were now clustered roundtheir mama in the drawing-room: she lay reclined on a sofa by thefireside, and with her darlings about her (for the time neitherquarrelling nor crying) looked perfectly happy. Me, she haddispensed from joining the group; saying, 'She regretted to be underthe necessity of keeping me at a distance; but that until she heardfrom Bessie, and could discover by her own observation, that I wasendeavouring in good earnest to acquire a more sociable andchildlike disposition, a more attractive and sprightly manner-something lighter, franker, more natural, as it were- she reallymust exclude me from privileges intended only for contented, happy,little children.'


1. 放贷人告诉赵萌,如果不违约,实收一万。
2. 当他们放弃了闪电扩张的闭环,回到了正常的商业思维和业务本质之中,他们谁都没成巨头,反而幸存下来,并且成为了赚钱的公司。
3.   "Ah, you are quite the pet of the ladies, Monsieur Porthos!"resumed the procurator's wife, with a sigh.
4.   "And that recommendation, with the exaggerated estimate of myability with which he prefaced it, was, if you will believe me,Watson, the very first thing which ever made me feel that a professionmight be made out of what had up to that time been the merest hobby.At the moment, however, I was too much concerned at the sudden illnessof my host to think of anything else.
5.   "That's right," he said; "I'm no good now. I was all right. Ihad money. I'm going to quit this," and, with death in hisheart, he started down toward the Bowery. People had turned onthe gas before and died; why shouldn't he? He remembered alodginghouse where there were little, close rooms, with gas-jetsin them, almost pre-arranged, he thought, for what he wanted todo, which rented for fifteen cents. Then he remembered that hehad no fifteen cents.
6. 虽然光是老赖,就当了158次,可他偏就是能一直四处奔走,不仅能拿补贴、拿钱,还能拿地、拿矿,堪称骗补永动机。


1. △12月4日,值班民警整理衣物,准备换岗。
2. 2019年12月16日,房子的房产证终于下来了,中介公司咨询房产证过户时,却发现房主的贷款仍没有结清,便给房主打电话,但房主却称在滨州出差,需要等几天。
3.   It was characteristic of this lady (as of some other people before her time and since) that whenever her original pro-position was questioned, she exaggerated it.

网友评论(62930 / 55533 )

  • 1:童国强 2020-07-18 02:59:51


  • 2:埃文·N·雷斯尼克 2020-07-26 02:59:51


  • 3:程宝宝 2020-07-31 02:59:51


  • 4:黎书凤 2020-07-20 02:59:51

      "I am satisfied," replied Zobeida; "you can go when you like."

  • 5:马思雅 2020-07-19 02:59:51


  • 6:郝伟 2020-07-17 02:59:51


  • 7:柴学友 2020-07-23 02:59:51

    The promotion of urbanization in central and western China has also attracted many members of the labor force from coastal cities in East China to inland regions, where the cost of living is much lower, Peng explained.

  • 8:袁檄文 2020-07-24 02:59:51

      "And the next day, Bernajoux. Yes, sire, yes, it is the same; andyour Majesty has a good memory."

  • 9:陈德光 2020-07-27 02:59:51


  • 10:张永涛 2020-07-17 02:59:51