—What do you think of the performance to

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.

在公差为d（d≠0）的等差数列{a_n}中，若S_n是{a_n}的前n项和，则数列S₆-S₃，S₉-S₆，S₁₂-S₉…也成等差数列，且公差为9d．类比上述结论，相应地在公比为q（q≠0，1）的等比数列{b_n}中，若T_n是{b_n}的前n项积，则有______．

下列哪一项属于正常咀嚼周期的特征？（）

A.运动中没有节律

B.形态不稳定

C.速度变化大

D.轨迹图具有似滴泪水的形态

某病在某地区显著超过该病历年发病率水平，称为

A．散发
B．暴发
C．流行
D．大流行
E．大暴发

FIDIC施工合同条件规定，工程通过竣工验收达到合同规定的“基本竣工”要求后，承包商申请颁发接收证书。该“基本竣工”是指( )。

A．完成扫尾，清理施工现场工作
B．完成所有缺陷修复工作
C．能按预定目的交给业主占用或使用
D．完成主体工程的施工任务