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问题 单项选择题

等渗性缺水的常见原因是

A．应用利尿药

B．入水量不足

C．慢性肠梗阻

D．消化液急性丧失是等渗性缺水的常见原因

E．大量出汗

答案

参考答案：D

解析：消化液急性丧失是等渗性缺水的常见原因，慢性丢失则属于低渗性缺水。

填空题


A Sports体育运动
Many animals engage in play，but homo sapiens is the only animal (1) have invented sports.Since sports are an invention，a part of culture (2) than an aspect of nature，all definitions of sports are somewhat arbitrary. (3) sports are a human universal found in every known culture or a (4) unique to modern society depends upon one’s definition of sports.Men and (5) have always run，jumped，climbed，lifted，thrown， and wrestled，but they have (6) always performed these physical activities competitively. Although all literate societies seem to (7) contests of one sort or another in which men， and sometimes women， (8) in displays and tests of physical skill and prowess，sports may be (9) defined as physical contests performed for their own sake and not for (10) ulterior end.According to this strict definition，neither Neolithic hunters nor contestants (11) religious ceremonies such as the ancient Olympic Games were engaged in sports. (12) on the stipulation that sports must be performed for their own sake (13) the paradoxical elimination of many activities which are usually thought of as (14) ，such as exercises done for the sake of cardiovascular fitness，races run (15) satisfy a physical education requirement，ball games played to earn a paycheck. (16) definition also means abandonment of the traditional usage in which"sport，"derived (17) Middle English disporter，refers to any light hearted recreational activity.In the. (18) of some 18th- century aristocrats，a game of backgammon and the seduction of (19) milkmaid were both considered good sport，but this usage of the term (20) become archaic.

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选择题

下列实验现象或结论叙述不正确的是（　　）

A．磷在空气中燃烧，生成大量的白烟

B．细铁丝在氧气中燃烧时火星四射，产生黑色固体

C．电解水时，生成氢气和氧气的体积比为1：2

D．硫在氧气中燃烧发出明亮的蓝紫色火焰
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