某施工项目招标，四家投标人的报价和评标价分别为：甲，1600万元,1630万元；乙，1620万元,1610万元；丙，1670万元,1620万元；丁，1630万元,1590万元，则中标候选人中排序第一的应为（　）

A:乙 B:丙 C:甲 D:丁

患者，男，60岁，左侧鼻翼处有一不规则形褐色肿物，表面有溃疡形成，切除肿物送检。

大体如图，镜检如图所示，正确的诊断是 ( )

A:低分化鳞状细胞癌 B:皮内痣 C:基底细胞癌 D:低分化腺癌 E:黑色素瘤

如图所示脊髓前2/3由脊髓哪根血管供血 ( )

A:脊髓后动脉 B:沟连合动脉 C:脊髓前动脉 D:冠状动脉 E:根后动脉

最早的广告经营业雏形可追溯到1630年的法国。

开普勒逝世于1630年。

Text 4 The first mention of slavery in the statutes of the English colonies of North America does not occur until after 1660 -- some forty years after the importation of the first Black people. Lest we think that slavery existed in fact before it did in law, Oscar and Mary Handlin assure us that the status of Black people down to the 1660’s was that of servants. A critique of the Handlins’ interpretation of why legal slavery did not appear until the 1660’s suggests that assumptions about the relation between slavery and racial prejudice should be reexamined, and that explanations for the different treatment of Black slaves in North and South America should be expanded. The Handlins explain the appearance of legal slavery by arguing that, during the 1660’s, the position of White servants was improving relative to that of Black servants. Thus, the Handlins contend, Black and White servants, heretofore treated Mike, each attained a different status. There are, however, important objections to this argument. First, the Handlins cannot adequately demonstrate that the White servant’s position was improving during and after the 1660’s; several acts of the Maryland and Virginia legislatures indicate otherwise. Another flaw in the Handlins’ interpretation is their assumption that prior to the establishment of legal slavery there was no discrimination against Black people. It is true that before the 1660’s Black people were rarely called slaves. But this should not overshadow evidence from the 1630’s on that point to racial discrimination without using the term slavery. Such discrimination sometimes stopped short of lifetime servitude or inherited status -- the two attributes of true slavery, yet in other cases it included both. The Handlins’argument excludes the real possibility that Black people in the English colonies were never treated as the equals of White people. The possibility has important ramifications. If from the outset Black people were discriminated against, then legal slavery should be viewed as a reflection and an extension of racial prejudice rather than, as many historians including the Handlins have argued, the cause of prejudice. In addition, the existence of discrimination before the advent of legal slavery offers a further explanation for the harsher treatment of Black slaves in North than in South America. Freyre and Tannenbaum have rightly argued that the lack of certain traditions in North America -- such as a Roman conception of slavery and a Roman Catholic emphasis on equality -- explains why the treatment of Black slaves was more severe there than in the Spanish and Portuguese colonies of South America, But this cannot be the whole explanation since it is merely negative, based only on a lack of something. A more compelling explanation is that the early and sometimes extreme racial discrimination in the English colonies helped determine the particular nature of the slavery that followed.

A:the origins of slavery, before the 1660’s, in the Spanish and Portuguese colonies. B:a growing consensus beginning in the 1630’s about what were the attributes of true slavery. C:the position of Black servants in the colonies in the 1630’s than by reference to their posi- tion in 1640's and 1650’s. D:the history of Black people in the colonies before 1660 than by reference to the improving position of White servants during and after the 1660’s.