此试题出现在
Passage 1 Despite the basic biological, chemical, and physical similarities found in all living things, a diversity of life exists not only among and between species but also within every natural population. The phenomenon of diversity has had a long history of study because so many of the variations that exist in nature are visible to the eye. (1) It has been suggested that sexual reproduction became the dominant type of reproduction among organisms because of its inherent advantage of variability, which is the mechanism that enables a species to adjust to changing conditions. New variations are potentially present in genetic differences, but how preponderant a variation becomes in a gene pool depends upon the number of offspring the mutants or variants produce (differential reproduction). (2) It is possible for a genetic novelty (new variation) to spread in time to all members of a population, especially if the novelty enhances the population’s chances for survival in the environment in which it exists. Thus, when a species is introduced into a new habitat, it either adapts to the change by natural selection or by some other evolutionary mechanism or else it eventually dies off. Because each new habitat means new adaptations, habitat changes have been responsible for the millions of different kinds of species and for the heterogeneity within each species. The total number of animal and plant species is estimated at between 2,000,000 and 4,500,000; authoritative estimates of the number of extinct species range from 15,000,000 up to 16,000,000,000. (3)Although the use of classification as a means of producing some kind of order out of this staggering number of different types of organisms appears as early as the book of Genesis—with references to cattle, beasts, fowl, creeping things, trees, etc.—the first scientific attempt at classification is attributed to the Greek philosopher Aristotle, who tried to establish a system that would indicate the relationship of all things to each other. He arranged everything along a scale, or “ladder of nature”, with nonliving things at the bottom; plants were placed below animals, and man was at the top. (4)Other schemes that have been used for grouping species include large anatomical similarities, such as wings or fins, which indicate a natural relationship, and also similarities in reproductive structures. (5) At the present time taxonomy is based on two major assumptions: one is that similar body construction can be used as a criterion for a classification grouping; the other is that, in addition to structural similarities, evolutionary and molecular relationships between organisms can be used as a means for determining classification.
有四个大学生都打算创业。小红非常渴望成功；小丽凡事都先做最坏的打算；小明很自信，自律性很强；小强习惯忍让，抗压性强。你认为四人相比，谁最有可能放弃创业机会、（）
双工通信的特点是什么？
报告的主要作用是（）。
钢绞线应在拉直条件下切断，切断前宜在切口两端用铁线扎紧，不得使用（）切割。下料长度偏差：张拉螺杆工艺，其绝对值不大于张拉时弹性伸长值的2%，且不大于5mm。工具锚工艺为±50mm。
简述全国人大的职权。
CRH2A统型动车组辅助压缩机气缸压力高于（）时，辅助压缩机停止工作。
（ ）年12月8日，国务院批准歙县为国家历史文化名城。
对糖尿病患者来说，在谷类食品中应尽量选择血糖指数低的品种。
下列各项对大部分企业内部控制制度执行现状的说法中不正确的是（）。
关于发放2021年度执业药师资格证书的通知
关于2021年度执业中药师职业资格考试(湘潭考区)考后人工核查合格人员名单公示
娄底考区2021年度执业药师职业资格考试考后人工核查情况公示
重庆市关于第二批执业药师考生现场资格复核的通告
广东省2021年度执业药师职业资格考试成绩合格人员公示
广东省2021年度执业药师职业资格考试潮州市成绩合格人员公示
广东省2021年度执业药师职业资格考试成绩合格人员公示（韶关考区）
关于2021年度天津市执业药师职业资格考试成绩合格、拟取得资格证书人员公示
茂名市2021年度执业药师职业资格考试成绩合格人员公示
湛江市2021年度执业药师职业资格考试成绩合格人员公示