问题 选择题

生活中难免会遇到一些突发事件,我们要善于利用学过的知识,采取科学、有效的方法保护自己.如果发生了氯气泄漏,以下自救方法得当的(  )

A.只要在室内放一盆水

B.向地势低的地方撤离

C.观察风向,顺风撤离

D.用湿毛巾或蘸有肥皂水的毛巾捂住口鼻撤离

答案

A、氯气与水反应,其速度慢且反应不充分,故A项错;

B、氯气的密度大于空气,故应向地势高的地方跑,故B项错;

C、逆风跑,才可以脱离氯气的笼罩,故C项错;

D、因肥皂水为弱碱性,则可以吸收氯气,以减少对口鼻的刺激,D正确;

故选:D

单项选择题
单项选择题

Surprisingly enough, modern historians have rarely interested themselves in the history of the American South in the period before the South began to become self-consciously and distinctively " Southern"—the decades after 1815. Consequently, the cultural history of Britain’s North American empire in the seventeenth and eighteenth centuries has been written almost as if the Southern colonies had never existed. The American culture that emerged during the Colonial and Revolutionary eras has been depicted as having been simply an extension of New England Puritan culture.

However, Professor Davis has recently argued that the South stood apart from the rest of American society during this early period, following its own unique pattern of cultural development. The case for Southern distinctiveness rests_ upon two related premises: first, that the cultural similarities among the five Southern colonies were far more impressive than the differences, and second, that what made those colonies alike also made them different from the other colonies. The first, for which Davis offers an enormous amount of evidence, can be accepted without major recitations, the second is far more problematic.

What makes the second premise problematic is the use of the Puritan colonies as a basis for comparison. Quite properly,Davis decries the excessive influence ascribed by historians to the Puritans in the formation of American culture. Yet Davis inadvertently adds weight to such ascriptions by using the Puritans as the standard against which to assess the achievements and contributions of Southern colonials. Throughout, Davis focuses on the important and undeniable differences between the Southern and Puritan colonies in motives for and patterns of early settlement, in attitudes toward nature and Native Americans, and in the degree of receptivity to metropolitan cultural influences.

However, recent scholarship has ply suggested that those aspects of early New England culture that seem to have been most distinctly Puritan, such as the p religious orientation and the communal impulse, were not even typical of New England as a whole, but were largely confined to the two colonies of Massachusetts and Connecticut. Thus, what in contrast to the Puritan colonies appears to Davis to be peculiarly Southern-acquisitiveness. A p interest in polities and the law, and a tendency to cultivate metropolitan cultural models were not only more typically English than the cultural patterns exhibited by Puritan Massachusetts and Connecticut, but also almost certainly characteristic of most other early modern British colonies from Barbados north to Rhode Island and New Hampshire. Within the larger framework of American colonial life, then, not the Southern but the Puritan colonies appear to have been distinctive, and even they seem to have been rapidly assimilating to the dominant cultural patterns by the last Colonial period.

What do we learn about the cultural history of Britain’s North American empire from Paragraph 1 ()

A. The southern colonies had never existed before 17C

B. Historians nowadays ignore it for some reason unknown

C. The American culture during the Colonial era was actually New England Puritan Culture

D. People today think that history was not recorded by government