把一块铁锻打成一定形状的工件以后，它的（ ） A．质量改变，体积不变 B．形状改

对长度为N的线性表进行顺序查找，在最坏情况下所需要的比较次数为______。

A．N+1

B．N

C．(N+1)/2

D．N/2

光伏发电及并网系统的难点在于（）。

A.微电网隔离装置

B.双向电能表

C.用电信息采集系统

D.光伏电池阵列

新能源技术的发展与其他技术的发展一样，很大程度上受社会需要的制约。石化燃料价格稳中有降使新能源技术的发展趋势减弱。但从长远看，科学的发展和资源条件的演变将推动能源技术的发展出现新的突破，产生真正代替石化能源技术的新能源技术。 这段话主要支持了这样一个论点，即( )

A．新能源的发展前景十分广阔

B．新能源可以代替石化能源

C．新能源技术虽在目前发展缓慢，仍是一项很有发展前途的技术

D．新能源不可能成为石化能源的替代产品

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 Simon assure us that the status of Black people down to the 1660’s was that of servants. (46) A critique of the Simons’ 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.

(47) The Simons explain the appearance of legal slavery by contending that, during the 1660’s, the position of White servants was improving relative to that of Black servants. Thus, the Simons argue, Black and White servants, heretofore treated alike, each attained a different status. There are, however, important objections to this argument. First, the Simons 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 Simons’ 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 points 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. (48) The Simons’ argument excludes the real possibility that Black people in the English colonies were never treated as the equals of White people.

This possibility has important ramifications. (49) 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 Simons 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. (50) Frey and Terry 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.

47（）

拒不执行火场指挥员指挥，影响灭火救灾的，可以选择的处罚种类有（）。

A、警告

B、罚款

C、罚金

D、十日以下拘留

E、十五日以下拘留