与可转换债券（Convertible Bond）相比，可交换债券（Exchangab

某化学研究性学习小组探讨Fe^3＋和之间发生怎样的反应，请你一起参与并协助他们完成实验。(1)提出猜想：

甲同学认为发生氧化还原反应，其反应方程式为____________________________________。

乙同学认为发生双水解反应，其反应方程式为2Fe^3＋＋3＋6H₂O===2Fe(OH)₃(胶体)＋3H₂SO₃。

……

(2)实验验证：

丙同学设计了下列实验来探究反应的可能性。

①为了检验所用Na₂SO₃是否变质，应选用的试剂是___               _____。

②取5 mL FeCl₃溶液于试管中，逐滴加入Na₂SO₃溶液至过量，观察到溶液颜色由黄色变为红棕色(无气泡产生，也无沉淀生成)。

③将②溶液分成两等份，其中一份加入稀盐酸至过量，再加入BaCl₂稀溶液，有白色沉淀生成；另一份滴入几滴KSCN溶液，溶液变成血红色。

(3)得出结论：

①根据丙同学的实验得出的结论是：________________                  ____________。

②实验③中溶液变成血红色的有关离子方程式为_________               ____。

(4)拓展探究：

①丁同学在FeCl₃溶液中加入Na₂CO₃溶液，观察到红褐色沉淀并且产生无色气体，该反应的离子方程式是________                               __________________。

②从形式上看，Na₂CO₃和Na₂SO₃相似，但是从上述实验中可以看到，两者的水溶液与氯化铁溶液反应的现象差别很大，其可能的原因除水解能力较小外，还有_             _______。

对生物进行分类的主要的目的不包括[ ]

A．了解生物的多样性  

B．了解生物之间的亲缘关系  

C．了解生物之间的进化关系  

D．了解生物的有害和有益物种

地球上的生物进行生命活动都要消耗___________，它们当中的绝大部分来源于分解_____________的过程。这些物质分子都是绿色植物通过光合作用制造的，同时，光合作用还吸收___________放出____________气，这是调节大气环境中这两种气体成分平衡的重要途径。

In Switzerland, six miles west of Geneva, lies a collection of laboratories and buildings, and most curious of ally a circular mound (36) more than 650 feet in diameter. This cluster has unique importance. It is Europe’s (37) atomic city dedicated to investigating the atom for peaceful purposes. The strange buildings (38) the European Council for Nuclear Research, more popularly known, from their French initials as CERV. The council was (39) when a handful of statesmen and scientific experts met in Paris in 1950. Their aim was to " (40) an organization providing for cooperation among European states in nuclear research of a pure scientific and fundamental character."
The CERV agreement was signed in 1953, and work on the atomic city began in 1954. Today CERV’s (41) are among the most modern and the most diversified in the world. Impressive as the scientific aspect may be, the real significance of CKRV may lie (42) the thousand people—scientists, lab workers, and administrative—group drawn from the fourteen member nations (43) populate it. British engineers work (44) with Swiss electricians and Yugoslav nuclear physicists. The official languages are French and English, with German an unofficial third. But CFRV is (45) tower of Babel—the language of science is universal and all-embracing.

A．one and best

B．one and only

C．one and an

D．one and mere

宋体的特点是（）

A、久读不易疲劳

B、方头方尾

C、视觉冲击力强

D、汉字传统书法的正体