为测试一铁片中铁元素的含量，某课外活动小组提出下面两种方案并进行了实验（以下数据为多次平行实验测定结果的平均值）：

方案一：将a g铁片完全溶解于过量稀硫酸中，测得生成氢气的体积为580　mL（标准状况）；

方案二：将

请回答下列问题：

（1）配平下面的化学方程式（将有关的化学计量数填入答题卡的横线上）：

______KMnO₄+______FeSO₄+______H₂SO₄=______Fe₂（SO₄）₃+______MnSO₄+______K₂SO₄+______H₂O

（2）在滴定实验中不能选择______式滴定管，理由是______；

（3）根据方案一和方案二测定的结果计算，铁片中铁的质量分数依次为______和______；（铁的相对原子质量以55.9计）

（4）高锰酸钾是化学中常用强氧化剂．在实验室中可用下式配制少量高锰酸钾溶液：

______Mn²⁺+______NaBiO₃+______H⁺=______MnO₄^-+______Bi³⁺+______Na⁺+______H₂O

1）、配平系数

2）、根据以上信息，下列各组离子在溶液中不能大量共存的是______

A．Na⁺、K⁺、H⁺、Cl^-、NO₃^-、MnO₄^-       B．Na⁺、K⁺、H⁺、SO₄^2-、BiO₃^-、Cl^-

C．Na⁺、Al³⁺、H⁺、NO₃^-、SO₄^2-、MnO₄^-    D．Na⁺、K⁺、Mn²⁺、NO₃^-、SO₄^2-、Cl^-．

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.