[题目]下列哪一个反应表示二氧化硫被还原 ( )A．SO2+2H2O+Cl2=H2SO4+2HCl B．SO2+2H2S=2H2O+3SC．SO2+2NaOH=Na2SO3+H2O D．SO2+Na2CO3=Na2SO3+CO2↑ 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】下列哪一个反应表示二氧化硫被还原 ( )

A．SO2+2H2O+Cl2=H2SO4+2HCl B．SO2+2H2S=2H2O+3S

C．SO2+2NaOH=Na2SO3+H2O D．SO2+Na2CO3=Na2SO3+CO2↑

【答案】B

【解析】A项，、SO2中硫元素的化合价由+4价升高为+6价，SO2被氧化；B项，SO2中硫元素的化合价由+4价降低为0价，SO2被还原；C项，元素化合价没有变化，不是氧化还原反应，SO2既未被氧化也未被还原；D项，元素化合价没有变化，不是氧化还原反应，SO2既未被氧化也未被还原。

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D．液体无色

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——No, it’s out of _________.

A. range B. reach C. control D. distance

【题目】短文改错

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处，每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。

删除：把多余的词用斜线(＼)划掉。

修改：在错的词下画一横线，并在该词下面写出修改后的词。

注意：

1. 每处错误及其修改均仅限一词；

2. 只允许修改10处，多者(从第11处起)不计分。

I asked Jack, a friend of mine, what has happened to him that night. He said that he had just got into bed on about half past eleven when the floor began to shake under him. The bed was also started shaking. He jumped out of his bed rapid and wanted to turn the light on. But the floor was shaking such violently that he could hardly reach the lamp. It seemed to take him long time to get to it and turned it on. Then he went to look out of the window. He saw that the houses on the other side of the street was also shaking. Then he knew that was happening — an earthquake! He quickly put on his clothes and ran out into the street to waiting until it was safe to go back inside.

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假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号 (∧)，并在其下面写出该加的词。

删除：把多余的词用斜线 (\) 划掉。

修改：在错的词下画一横线，并在该词下面写出修改后的词。

注意：

1.每处错误及其修改均仅限一词；

2.只允许修改10处，多者(从第11处起)不计分。

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