下列（）是二手车鉴定评估报告书对委托方的作用。 A.是评估机构评估成果的体现 B.作

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.

损伤后容易出现喉狭窄的是（）。

A.气管

B.左、右主支气管

C.肺叶支气管

D.肺段支气管

E.环状软骨

延胡索的主要镇痛、镇静成分为（）

A.去氢延胡索甲素

B.延胡索乙素

C.挥发油

D.香豆素类

E.生物碱类

头晕、乏力、晕厥常见于（）

A.室早

B.房室传导阻滞

C.预激综合征

D.房早

E.病窦综合征

化学平衡的外部特征是在条件一定时整个反应系统中各物质的（）不再随时间而变化。

A、浓度

B、温度

C、压力

D、速度