下面的说法中正确的是[ ] A．节日里高大建筑物周围的装饰灯，它们之间是并联的

病案库房建筑的耐火等级为（）。

A.一级

B.二级

C.三级

D.四级

E.未规定耐火等级

65岁老年男性，陈旧性股骨颈骨折，股骨头缺血性坏死，最佳治疗方法是

A．股骨头钻孔、植骨

B．人工髋关节置换术

C．髋关节融合术

D．药物治疗

E．经粗隆旋转截骨

Я справился с этой работой только ______ вашей помощи.

A．из-за

B． благодаря

C．от

D．по

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.

氨纶有什么作用？