问题 选择题

能在水溶液中大量共存的一组离子是(  )

A.H+、I-NO3-SiO32-

B.Ag+、Fe3+、Cl-SO42-

C.K+SO42-、Cu2+NO3-

D.NH4+、OH-、Cl-HCO3-

答案

A.因H+、I-、NO3-发生氧化还原反应,H+、SiO32-结合生成沉淀,不能共存,故A错误;

B.因Ag+、Cl-结合生成沉淀,则不能共存,故B错误;

C.该组离子之间不反应,能共存,故C正确;

D.NH4+、OH-结合生成弱电解质,OH-、HCO3-结合生成水和碳酸根离子,则不能共存,故D错误;

故选C.

选择题
阅读理解

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The results of the US/NATO bombing Yugoslavia are to be judged by history. I shall not be the one to do this. But being in the center of actual events that are creating that history, I cannot stay away from what is going on in my country.

  First of all, the main aim of the bombing was to prevent a human suffering in Kosovo. Today, after many days of frequent bombing, that aim is more distant than before. The bombing only brought tens of thousands of people running away from their homes, not to mention the large number of the death and injury, buildings and factories. Suppose that the US/NATO really had a wish to prevent the human suffering, they should realize by now how wrong they were when they thought the bombing would solve the problem.

  So, what’s left? Back off or ground troops? But who is going to join the ground troops? It would take at least 200,000 armed soldiers, not the 20,000 that the US/NATO have prepared in Macedonia. It should also be clear that the Serbs(塞族人) will not give up on Kosovo.

  I live under continuous bombing for more than a week now, and it doesn’t frighten me anymore. I don’t turn to the shelter at the sound of warning. It’s the thought of ground troops that frightens me. Vietnam would seem like a picnic compared to a bloodshed(流血事件) in Kosovo if the ground troops appear. Is that what the US/NATO wants?

72. Which of the following statements is true?

  A. The US/NATO really intends to stop the human suffering.

  B. The result of the war will be judged by people in Kosovo.

  C. The bombing made tens of thousands of people homeless.

  D. The continuous bombing will make the Serbs give up on Kosovo.

73. The writer is _____.

  A. an American reporter      B. a Chinese reporter

  C. a Macedonian        D. a Yugoslavian

74. What worries the writer most?

  A. The continuous bombing.      B. The coming of the ground troops.

  C. The sound of bomb warning.    D. The idea of ground troops.

75. What is the writer’s attitude towards the bombing in Kosovo?

  A. It is the US/NATO’s duty to defend Kosovo.

  B. It is wrong to solve the problem by bombing Kosovo.

  C. The aim of bombing Kosovo is to stop a human suffering.

  D. The bombing can solve the problem of Kosovo.