问题 选择题

金属铜的提炼多从黄铜矿开始.黄铜矿的焙烧过程中主要反应之一的化学方程式

  

A.方框中的物质应为 Cu2S

B.若有1 molSO2 生成,则反应中有4 mol 电子转移

C.SO2既是氧化产物又是还原产物

D.O2只作氧化剂

答案

答案:B

A正确,根据质量守恒定律可得方框中的物质应为 Cu2S;B错,若有1 molSO2 生成,则反应中有7 mol 电子转移;C正确,SO2既是氧化产物又是还原产物;D正确,氧气在反应中元素化合价降低,只作氧化剂;

阅读理解

Have you heard about “Survival (生存)Holidays”? “Survival Holidays” is for children to go into the lonely place for exciting activities. Now about 1,100 companies are allowed to take children into the great outdoors without their parents.

The reason why people like “Survival Holidays” is that they think being close to nature is good for children. Many children in big cities spend all time watching TV and playing computer games. “Survival Holidays” gives them an important change.

Is “Survival Holidays” a wonderful idea? Maybe it is. Children need more free time to play. They need to be left on their own, without adults disturbing(打扰) them. Parents care too much about their children. They like to see the children being busy with activities that are controlled by adults, but children don’t know what to do when they are in danger. Even something like crossing a small river seems to be a hard challenge. Children are not comfortable with danger. Even small danger like getting their feet wet or falling down seems very terrible to them.

Many people think the survival activities are good for children. Even years later, they will still remember what they have learned. Some have learned to stay calm in different times. Some have learned how to keep safe. Others have learned how to work in a team. All these skills will help them a lot in their lives.

小题1:Is “Survival Holidays” for children or parents?

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小题2:Why do people like “Survival Holidays”?

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小题3:What do the children in big cities usually do?

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小题4:How do children feel when they are in danger?

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小题5:What can children learn in the survival activities?

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