问题 问答题

婴幼儿,尤其是年龄小者,为什么既容易发生脱水又容易发生水中毒

答案

参考答案:婴幼儿时期既容易发生脱水又容易发生水中毒的原因是由小儿体液平衡的特点所决定的:① 年龄越小,体液总量相对愈多,每日出入量相对愈多。婴儿每日的水交换量约等于细胞外液的1/2,而成人仅为1/7,婴儿的水交换率比成人高3~4倍。所以小儿尤其是婴儿对缺水的耐受力比成人差,比成人更易出现脱水。② 小儿年龄愈小,肾脏的调节功能愈不成熟。新生儿出生1周后肾脏稀释能力可达到成人水平,但由于肾小球滤过率低,水的排泄速度较慢,若摄入水量过多则易致水肿和低钠血症。③ 婴幼儿时期中枢神经系统发育亦未完善,调节功能差,脑性低钠血症发生率高。④ 婴儿时期因产伤、缺氧、感染等所致颅脑疾患相对较多,引起ADH分泌亢进,亦是造成水中毒的原因。

单项选择题

Military victories, trade, missionary zeal, racial arrogance and a genius for bureaucracy all played well-documented roles in making the British Empire the largest the world has known. Rather less well understood was the importance of the moustache. A monumental new history, The Decline and Fall of the British Empire by Piers Brendon, promises to restore this neglected narrative to its rightful place in the national story.
Dr. Brendon, a Fellow of Churchill College, Cambridge University, argues that colonial moustaches had a clear practical purpose: to demonstrate virility and intimidate the Empire’s subject peoples. The waxing and waning of the British moustache precisely mirrored the fortunes of the Empire-blooming beneath the noses of the East India Company’s officers, finding full expression in Lord Kitchener’s bushy appendage and fading out with the Suez crisis in Anthony Eden’s apologetic wisps.
This analysis of the growth of the stiff upper lip is an essential strand of Dr. Brendon’s epic 650-page political, cultural, economic and social history of the Empire, which is published on October 18. "It is a running gag in a serious book, but it does give one a point of reference," he said yesterday. In the 18th and early 19th century, sophisticated Britons wore wigs but spurned facial hair. The exception was the King, George III, whose unshaven appearance was mocked as a sign of his madness. However, by the 1830s the "moustache movement" was in the ascendancy. British officers, copying the impressive moustaches that they encountered on French and Spanish soldiers during the Napoleonic Wars, started the craze, but the real impetus came form India.
Just as British troops in Afghanistan today are encouraged to grow beards to ease their dealings with local tribesmen, so the attitudes of Indian troops under the command of East India Company officers in the first half of the 19th century altered the appearance of the British soldier. "For the Indian sepoy the moustache was a symbol of virility. They laughed at the unshaven British officers," Dr. Brendon said. In 1854 moustaches were made compulsory for the company’s Bombay regiment. The fashion took Britain by storm as civilians imitated their heroes.
Dr. Brendon writes. "During and after the Crimean War, barbers advertised different patterns in their windows such as the ’Raglan’ and the Cardigan’." Moustaches were clipped, trimmed and waxed "until they curved like sabres and bristled like bayonets". After 1918 moustaches became thinner and humbler as the Empire began to gasp for breath, even as it continued to expand territorially. It had been fatally wounded, Dr. Brendon suggests, by the very belief in the freedom that it had preached. After the victory over Germany and Japan in 1945, independence movements across the red-painted sections of the world map, and Britain’s own urgent domestic priorities, meant that the Empire was doomed.
The moustache too was in terminal decline. "It had become a joke thanks to Charlie Chaplin and Groucho Marx. It had become an international symbol of ’villainy’ thanks to Hitler’s toothbrush," writes Dr. Brendon. In Britain it was also synonymous with the "Colonel Blimps"o clinging to an outmoded idea of colonial greatness.
In Eden’s faint moustache Britain’s diminished international status found a fitting symbol. It all but disappeared on TV and, moments before his broadcast on the eve of the fateful occupation of the Suez Canal in 1956, his wife had to blacken the bristles with mascara. His successor, Harold Macmillan, was the last British Prime Minister to furnish his upper lip. Harold Wilson, the self-styled man of the people, had been clean shaven since the 1940s, Dr. Brendon notes. "He obviously believed that the white hot technological revolution was not to be operated with a moustache.\

According to the passage, the Crimean War which witnessed the development of different patterns of the British moustache was fought ______.

A.in the early 19th century

B.in the 18th century

C.in the middle of the 19th century

D.in the late 18th century

单项选择题