问题 阅读理解

Over the past ten years, we have made some big steps forward in our common struggle for development, security and human rights. Aid and debt relief have increased, making the world economy somewhat fairer. At last, the world is taking action against HIV/AIDS. There are fewer wars between countries than there used to be; and many civil wars have ended. More Governments are elected by, and responsible for, the people whom they govern. And all States protect people from war crimes, racial cleansing and crimes against humanity.

But there is so much that still needs doing. The gap between rich and poor continues to grow. Many people still face serious crime, discrimination, and racial conflict. Nuclear weapons require urgent attention. Terrorism, and the reaction to it, is spreading fear and suspicion. It seems that we don't even agree which threats are most important. Those who live on small islands may see global warming as the biggest danger. Those who live in a city that has suffered terrorist attacks, like New York, or Mumbai, or Istanbul, may feel that fighting against terrorism is more urgent. Others again may cite poverty, disease, or genocide. The truth is, these are all global threats. All of us should be concerned about all of them. Otherwise, we may" not succeed in dealing with any of them.

At this time of all times, we cannot afford to be divided. I know that you, the peoples of the world, understand this. Thank you for all the support and encouragement you have given me throughout these ten difficult but exciting years.

Please urge your leaders to work with my successor, and make the United Nations ever stronger and more effective.

Long live our planet and its peoples. Long live the United Nations!

72. The first paragraph mainly describes______________.

A. the fact that the United Nations has become stronger

B. the achievements that the United Nations has made

C. the threats that the United Nations has come across

D. the steps that have been taken to help developing countries

73. From the second paragraph we learn___________________.

A. which problems are the most important

B. the task to improve our world is not so difficult

C. we still have a long way to go to achieve world peace

D. the future of the world is not certain

74. According to the text, which of the following is not true?

A. Islanders care more about terrorism than global warming.

B. More leaders are voted for by the people for. whom they are responsible, whom they govern.

C, The speaker has spent almost all his professional life working for the United Nations

D. People around the world don't agree which threats are most important,

75. The speech must have been made by the_________________.

A. Secretary-General of the UN           B. president of the US

C. prime minister of the UK              D. president of the PRC

答案

小题1:B

小题2:C

小题3:A

小题4:A

         

实验题

(13分)下表是某城市某日空气质量报告:

某研究性学习小组对表中首要污染物S0:导致酸雨的成因进行探究。

(提示:S02:是一种无色、有刺激性气味的有毒气体,易溶于水,具有与C0:相似的化学性质)

【探究实验】实验一:用下图所示装置进行实验。

(1)A装置的作用是__________ S02气体。

(2)实验过程中,B装置内石蕊试纸的颜色没有发生变化,C装置内湿润的蓝色石蕊试纸变红色,说明S02与水反应生成一种_________________。

(3)D装置的作用是__________,发生反应的化学方程式是______________。

实验二:往盛有水的烧杯中通人S02气体,测所得溶液的pH ______ 7(填“>”“=”或“<”),然后每隔l小时测定其pH,发现pH逐渐变小,直至恒定,说明烧杯中溶液被空气中的氧气氧化最终生成H2S04

【查阅资料】S02形成酸雨的另一途径:S02与空气中的02在飘尘的作用下反应生成S03(飘尘的质量和性质在反应前后不发生变化),S03溶于降水生成H2S04。在此过程中飘尘作____。

【探究结论】S02与空气中的氧气、水反应生成硫酸而形成酸雨。该市可能易出现酸雨。

【模拟实验】(1)由于食醋和酸雨的酸度(pH)差不多,因此酸雨对大理石的作用可以通过大理石碎片放在醋中来模拟。当把2.0 g大理石碎片放在醋中一整夜后,取出固体干燥称重,其质量可能是(醋酸钙易溶于水) __________。

A.小于2.0 g   B.正好2.0 g   C.大于2.0 g

(2)这组学生还做了另一个实验,即将大理石碎片放在蒸馏水中过夜,其实验的目的是______

【知识联想】S02具有与C0:相似的化学性质,根据右图给出的S02及其化合物问的相互转化关系回答:X的化学式是_____,写出X与Na2S03反应的化学方程_____________________,反应类型是_________________________。

单项选择题