房屋权属登记中的总登记是指（）以上的地方人民政府根据需要在一定期限内对本行政区域内的

下列说法正确是[ ]

A．石油的分馏和实验室制乙烯都要用到冷凝装置

B．乙烯和丙烯以1∶1(物质的量)聚合时，生成的高聚物的结构一定是

C．检验溴乙烷含溴可向其中直接加硝酸酸化的硝酸银溶液

D．植物在隔绝氧气的情况下腐败，可生成甲烷

  Drawings of human colonies on other planets often picture the entire community under a glass or plastic bubble. The bubble is intended to create an atmosphere with adequate oxygen and other essential elements. But similar bubble-like structures have also been constructed on earth. One of the most famous, and controversial, is a site in the Arizona desert.

Biosphere 2, as it is called, was built not far from Tucson in 1984 and is now run by Columbia University. This huge（7,200,000-cubic-foot）glass and steel construction contains several separate ecosystems, including a desert, a rain forest, and a 900,000-gallon “ocean.” The climatic conditions-humidity, temperature, air quality-are regulated by sensors and can be adjusted as needed or desired. For example, a rainstorm can be created to increase the humidity. The adjustable features of Biosphere 2 make it an ideal location to perform experiments to help determine the effects of such climatic changes as global warming.

The current conditions at Biosphere 2 are vastly different from those in 1993, when eight people who had moved into the environment with great fanfare two years earlier moved out in failure. Though promising to be self-sufficient（自足的）, these “colonists” had so much trouble regulating the environment that they reportedly had food smuggled into them. Oxygen levels became dangerously low; most plants and animals died. In taking over the unsuccessful site, Columbia hopes to erase its notorious past by focusing on small research projects that gradually answer some of Biosphere 1’s — that is, Earth’s most basic environment questions.

小题1:This passage primarily deals with _________.

A．conditions of life in Biosphere 2

B．building controlled environments on other planets

C．why Biosphere 2 failed in the past

D．what makes a good biosphere colonist小题2:Biosphere 2 is now run by _________.

A．a group of eight colonists

B．Columbia University

C．the city of Tucson

D．scientists who hope to establish Biosphere 3小题3:The passage suggests that earlier colonists of Biosphere 2 _________.

A．did not like living in a controlled environment

B．found it very difficult to live in a controlled environment

C．still are involved with Biosphere 2

D．have now left the country in disgrace小题4:The writer helps you understand what Biosphere 2 is like by _________.

A．comparing its features with those of an outer space biosphere

B．explaining the process by which it was constructed

C．referring to an interview with one of former inhabitants

D．describing its appearance and conditions小题5:In paragraph 3 the word “notorious” means _________.

A．well known for something good

B．well known for something bad

C．very dangerous

D．quite interesting

（1）甲、乙、丙、丁是初中化学常见的化合物，甲和乙中含有碳元素，丙能做干燥剂．它们之间有如图1所示的转化关系（部分物质和反应条件已略去）．则甲的化学式为______；丙转化为丁的化学力．程式为______．

（2）图2是某趣味实验装置图．挤压胶头滴管后，可观察到气球胀大的现象．请分析其原因，并写出化学方程式．

（3）利用图3装置可做CO还原Fe₂O₃，的实验，并检验该反应生成的气体产物．已知由A装置制取的CO气体中混有少量的CO₂．

①CO与Fe₂O₃反应的化学方程式为______．

②气体通过装置的顺序是A→______（装置不能重复使用）．

③从环保角度考虑，对以上装置的改进措施是______．

（4）称取12.5g石灰石（主要成分是CaCO₃，杂质不参加反应）放人烧杯中，向其中加入50g稀盐酸，二者恰好完全反应．反应结束后称量烧杯中剩余物质的总质量为58.1g（不包括烧杯的质量，且气体的溶解忽略不计）．试计算石灰石中杂质的质量分数．

为了促进本国汽车产业，甲国出台规定，如生产的汽车使用了30%国产零部件，即可享受税收减免的优惠。依世界贸易组织的相关规则，关于该规定，下列哪一选项是正确的（）

A.违反了国民待遇原则，属于禁止使用的与贸易有关的投资措施

B.因含有国内销售的要求，是扭曲贸易的措施

C.有贸易平衡的要求，属于禁止的数量限制措施

D.有外汇平衡的要求，属于禁止的投资措施