Cu的化合物在生活及科研中有重要作用，不同反应可制得不同状态的Cu₂O
（1）科学研究发现纳米级的Cu₂O可作为太阳光分解水的催化剂。
①在加热条件下用液态肼（N₂H₄）还原新制Cu（OH）₂可制备纳米级Cu₂O，同时放出N₂。当收集的N₂体积为3.36L（已换算为标准状况）时，可制备纳米级Cu₂O的质量为        ；

②一定温度下，在2 L密闭容器中加入纳米级Cu₂O并通入0.20 mol水蒸气，发生反应：
  ；测得20 min时O₂的物质的量为0.0016 mol，则前20 min的反应速率v（H₂O）=                  ；该温度下，反应的平衡常数表达式K=                  ；下图表示在t₁时刻达到平衡后，只改变一个条件又达到平衡的不同时段内，H₂的浓度随时间变化的情况，则t₁时平衡的移动方向为      ，t₂时改变的条件可能为              ；若以K₁、K₂、K₃分别表示t₁时刻起改变条件的三个时间段内的平衡常数，t₃时刻没有加入或减少体系中的任何物质，则K₁、K₂、K₃的关系为                ；
（2）已知：ΔH＝－293kJ·mol^－1           
ΔH＝－221kJ·mol^－1
请写出用足量炭粉还原CuO（s）制备Cu₂O（s）的热化学方程式        ；
（3）用电解法也可制备Cu₂O。原理如右上图所示，则阳极电极反应可以表示为        。

阅读理解

About big cities

　　New York, London, Paris and other big cities are wonderful places to live in. There are many nice things to see and to do. You can go to different kinds of museums, plays and films. You can also go shopping to buy things from all over the world.

　　But there are serious problems in big cities, too. The cost of living is high, and there are too many people in some places. Every year many people move to the cities because there are more chances to find jobs, to study at good schools and to receive good medical care. But sometimes these people can not find jobs or good places to live in. Also, too many people in a small space make it hard to keep the cities safe and clean.

　　Some people enjoy staying in big cities, others do not. Before people move to a big city, they should think about the problems of staying there.

　　注释　　1．museum[PU((:)>L!+P]n．博物馆　　2．cost[E&KC]n．成本；费用

　　3．receive[T!>K!:H]v．收到，接到，接收　　4．medical care n．医疗保健制度

阅读上述短文，并完成下列练习

一、根据短文内容，把住在大城市的优点和大城市有可能遇到的问题写在相应处。

advantage(优点)：________________________________________

problems(问题)：________________________________________

二、把下列英语解释前的序号填在相应的单词或短语前的括号内。

1．all over the world　　A．work

2．different　　　　　　B．important and worrying things

3．serious　　　　　　C．to take or go from one place to another

4．job　　　　　　　　D．everywhere in the world

5．move　　　　　　　E．not the same

三、根据短文内容，判断正误(T or F)。

1．In big cities, it's easy for people to buy things.

(　　)

2．You'll spend more money when you live in a big city.

(　　)

3．People move to the big cities only because there are more chances to find jobs.

(　　)

4．All the people like living in big cities.

(　　)

5．If you want to move to a big city, you should be ready to face a lot of problems.

(　　)

Sam is twenty-seven now. He’s tall and strong. He worked hard in the small field. He’s known a girl called Mabel for three years, who lives in another village. He wishes she could marry him soon, but she won’t marry him until he has built a new house. He hasn’t enough money. Of course it’s difficult for him to do so.
Winter had come and the fields were covered with thick snow. Sam had nothing to do at home. Mabel told him to find some temporary employment in the town. He thought she was right and came to Mr White’s factory, where he carried stones from the hill to the workplaces. It was hard work but he was paid more. At the end of the month Mr White paid the young man nearly two thousand dollars. He was very happy. He hurried to the post office, but it was closed. He had a look at the clock on the wall. It was half past five, and he was told to go there the next morning. He had to return to the factory. He felt hungry and went into a restaurant and ate something. He didn’t see a thief following him, and as soon as he sat at table, the man sat down next to him and asked him to drink a cup with him. He agreed and drank a lot. And when he woke up two hours later, his money was stolen. He was sad of it and cried for a long time.
The following day Mr White saw the young man’s eyes were red and asked what had happened to him. He told him about it and at last he said, “I worked for the thief last month!”
根据材料内容选择最佳答案，将其标号填入题前括号内。
【小题1】Mabel doesn’t marry Sam because _______.

A．he lives in a small field	B．he’s a poor farmer
C．he lives in an old house	D．he is too tall

【小题2】Mabel asked Sam to ______.

A．make money in the town	B．borrow some money from his friend
C．spend the winter in town	D．build a house in her village

【小题3】The underlined word “temporary employment” means _______.

A．许多钞票

B．全职工作

C．临时工作

D．轻松工作

【小题4】Sam went the post office to _____.

A．ring up Mabel

B．post the money

C．buy some stamps

D．post a letter

【小题5】The money was stolen when ______.

A．Sam left the factory	B．Sam went into the restaurant
C．Sam ate something in the restaurant	D．the thief got Sam drunk.

Sam is twenty-seven now. He’s tall and strong. He worked hard in the small field. He’s known a girl called Mabel for three years, who lives in another village. He wishes she could marry him soon, but she won’t marry him until he has built a new house. He hasn’t enough money. Of course it’s difficult for him to do so.

Winter had come and the fields were covered with thick snow. Sam had nothing to do at home. Mabel told him to find some temporary employment in the town. He thought she was right and came to Mr White’s factory, where he carried stones from the hill to the workplaces. It was hard work but he was paid more. At the end of the month Mr White paid the young man nearly two thousand dollars. He was very happy. He hurried to the post office, but it was closed. He had a look at the clock on the wall. It was half past five, and he was told to go there the next morning. He had to return to the factory. He felt hungry and went into a restaurant and ate something. He didn’t see a thief following him, and as soon as he sat at table, the man sat down next to him and asked him to drink a cup with him. He agreed and drank a lot. And when he woke up two hours later, his money was stolen. He was sad of it and cried for a long time.

The following day Mr White saw the young man’s eyes were red and asked what had happened to him. He told him about it and at last he said, “I worked for the thief last month!”

根据材料内容选择最佳答案，将其标号填入题前括号内。

1.Mabel doesn’t marry Sam because _______.

A．he lives in a small field	B．he’s a poor farmer
C．he lives in an old house	D．he is too tall

2.Mabel asked Sam to ______.

A．make money in the town	B．borrow some money from his friend
C．spend the winter in town	D．build a house in her village

3.The underlined word “temporary employment” means _______.

A．许多钞票

B．全职工作

C．临时工作

D．轻松工作

4.Sam went the post office to _____.

A．ring up Mabel

B．post the money

C．buy some stamps

D．post a letter

5.The money was stolen when ______.

A．Sam left the factory	B．Sam went into the restaurant
C．Sam ate something in the restaurant	D．the thief got Sam drunk.