摘要:27.有7种物质:NH3.Mn2O3.ZnCl2.MnO2.NH4Cl.Zn和H2O.分别是锌一锰电池中氧化还原反应的反应物和生成物. (1)①完成并配平该氧化还原方程式: + + NH4Cl= + + + NH3 ②发生还原反应的物质是 .被氧化的元素是 . ③若有17.4 g氧化剂参与反应.则电子转移数目为 NA(NA表示阿伏加德罗常数) (2)普通锌一锰干电池是利用上述反应原理设计的.其结构如右图所示.回答下列问题: ①电池中电解质溶液为 . ②正极材料为 , 正极电极反应为 . ③放电时NH4+向 移动. ④普通锌一锰电池的缺点是电量小.放电电流弱.为增大放电电流.可把负极锌片改为锌粉.其理由是 .

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听力(共两节,满分30分)

第一节 听下面5段对话。每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳选项。听完每段对话后,你都有10秒钟的时间来回答有关小题和阅读下一题。每段对话仅读一遍。

1.What i s Jack' s occupation now?

A.A secretary.

B.A noveli st.

C.A new spaperman.

2.Where doe s thi s conver sation mo st likely take place?

A.In a lab.

B.In a clinic.

C.In a dining hall.

3.How old i s Jane?

A.19.

B.27.

C.35.

4.How often doe s the man go to vi sit hi s teacher?

A.At lea st once a year.

B.Once every two year s.

C.Twice a month.

5.How did the woman feel about the Engli sh program?

A.It' s intere sting.

B.It' s difficult.

C.It' s important.

第二节(共15小题:每小题15分,满分22.5分)

请听下面5段对话。每段对话后有几个小题,从题中所给出的A、B、C三个选项种选出最佳选项。听每段对话前,你将有时间阅读各个小题,每小题5秒钟;听完后,各小题给出5秒钟的作答时间。每段对话读两遍。

听第6段材料,回答第6、7题.

6.How doe s the man seem to feel after thi s job interview?

A.Anxiou s.

B.Hopeful.

C.De sperate.

7.How many interviewee s were able to go to the second interview?

A.4.

B.12.

C.16.

听第7段材料,回答第8、9题。

8.How much will the man pay?

A.15 yuan.

B.55 yuan.

C.50 yuan.

9.How long doe s the Cheaper way take?

A.At lea st two week s.

B.At lea st ten day s.

C.It' s lea st ten week s.

听第8段材料,回答第10至12题。

10.Why doe s the man refu se the fir st flat?

A.It' s too smal1.

B.It' s too expen sive.

C.It' s not on the top floor.

11.Why doe s the woman let the man look at the second flat fir st?

A.He i s clean and quiet.

B.He i s kind and polite.

C.He i s poor and hone st.

12.How much will the man pay before moving in?

A.$100.

B.$50.

C.$30.

听第9段材料,回答第13至16题。

13.What i s Tom doing?

A.Li stening to Engli sh song s.

B.Surfing the Internet.

C.Preparing for a te st.

14.How doe s the woman find studying Engli sh?

A.Intere sting.

B.Boring.

C.Difficult.

15.What doe s the woman sugge st the man do?

A.Play more game s online.

B.Talk with friend s online more often.

C.Learn We stern culture online.

16.What will the woman do next?

A.Go to school.

B.Take an exam.

C.Review le s son s.

听第10段材料,回答第17至20题。

17.Who i s the speaker talking to?

A.People showing intere st in the theater.

B.People working in the building.

C.People vi siting the univer sity.

18.What i s the video showing today?

A.The teacher s of the univer sity.

B.The hi story of the theater.

C.The building s in the city.

19.How soon will people meet again?

A.In an hour and a half.

B.In half an hour.

C.In an hour.

20.What i s the purpo se of the speaker' s talk?

A.To tell people the rule s they should follow.

B.To give people a brief introduction.

C.To show people the direction.

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听力(共两节,满分15分)

第一节(共5个小题,每小题1分)

听下面5段对话。每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳选项。听完每段对话后,你都有10秒钟的时间来回来有关小题和阅读下一小题。每段对话仅读一遍。

1.What does the woman want to do?

A.Take a break

B.Buy a new computer

C.Continue to deal with the software

2.What are the speakers doing?

A.Trying a new recorder

B.Playing games

C.Listening to music

3.When did the woman’s mother probably start to prepare for Christmas?

A.January

B.November

C.December

4.What might the speakers’ relationship be?

A.Doctor and patient

B.Writer and reader

C.Teacher and student

5.What will the man do today?

A.Relax himself

B.Start to work

C.Ask a day off

第二节(共15小题,每小题1分)

请听下面5段对话。每段对话后有几个小题,从题中所给出的A、B、C三个选项种选出最佳选项。听每段对话前,你将有时间阅读各个小题。,每小题5秒钟;听完后,各小题给出5秒钟的作答时间。每段对话读两遍。

听下面一段读白,回答第6至第8小题

6.Where did the man see the ad for the bike sale?

A.In a department store

B.In the newspaper

C.On TV

7.Which bike is the latest model?

A.The Curzon

B.The Aderson

C.The Instant

8.What does the man decide to do in the end?

A.Buy the one recommended by the woman

B.Buy the cheapest one

C.Go to the shop to look at the bike first

听下面一段读白,回答第9至第11小题

9.What do coin collectors value most?

A.The age of the coin

B.The shape of the coin

C.The condition of the coin

10.Which of the following is in “mint” condition?

A.Coins with unclear pictures

B.coins with special colors

C.Coins that are like new

11.How should one deal with dirty coins according to Mr.Silver?

A.Wash them in water

B.Never clean them

C.Wipe them with a piece of cloth

听下面一段读白,回答第12至第15小题

12.What did the two men do the night before they left Australia?

A.They drank beer together and got drunk

B.They stayed up late with fans

C.They went shopping

13.What happened on their way to the airport?

A.They killed a kangaroo

B.Their car hit a kangaroo

C.A kangaroo took their jacket

14.Why was the motorist surprised at the sight of the kangaroo?

A.It was running at the airport

B.It was in a green jacket

C.It was bleeding

15.Where were the men’s air tickets?

A.In the pocket of the green jacket

B.In the car

C.In the hotel

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