23. The factory produces half a million pairs of shoes every year, _________ are sold abroad.

A. 80% of them　　 B. 80% of that　　　　　　　 C. 80% of the shoes　　　　　　 D. 80% of which　

22. China isn't the country _________ she used to be 50 years ago.

A. that　　　　　　　　　 B. which　　　　　　　 C. what　　　　　　　　　　　　 D. since

第一节 单项填空 (共10小题；每小题1分，满分10分)

从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。

21. Do you have anything 　　　　　　is important to tell me?

A. which　　　　　　　 B. that　　　　　　　　　 C. /　　　　　　　　　　　　　　　 D. it

做听力部分时，请先在试题卷上作答。听力部分结束前，你将有两分钟的时间将第1至第16小题的答案转涂到答题卡上，将第17至20小题的答案转写到答题卡上。

SECTION A

Directions: In this section, you’ll hear 6 conversations between 2 speakers. For each conversation, there are several questions and each question is followed by 3 choices. Listen to the conversations carefully and then answer the questions by marking the corresponding letter (A, B or C) on the question booklet. You will hear each conversation twice.

Conversation l

1. What happened to the man?

A. He forgot to bring his student card.

B. He forgot to bring his library card.

C. He lost some of the borrowed books.

　　 2. When should the man return what he has borrowed?

　　 A. Before next Wednesday.

　　 B. Between Monday and Thursday.

C. No later than next Thursday.

Conversation 2

　　 3. What’s the probable relationship between the two speakers?

　　 A. Shopkeeper and customer.

　　 B. Waitress and customer.

　　 C. Saleswoman and customer.

　　 4. How does the man pay?

　　 A. Write a check to the woman.

　　 B. Ask the woman to get him the bill.

　 　C. Go to the cashier to pay for it himself.

Conversation 3

5. Why does the woman want to change the Color of her lipstick?

A. To be cool.　　 　　　　　　　　　　 B. To be serious.　　 　　　　　 C. To be attractive.

　　 6. What do we know about the lipstick the woman took in the end?

　　 A. Its color is suitable but it is very expensive.

　　 B. Its color is right though it is not Lyfel brand.

　　 C. Its color isn’t bright but its brand is Lyfel.

Conversation 4

　　 7. What is the relationship between the two speakers?

　　 A. Boss and secretary.　　　　　　　　 B. Colleagues.　　　　　　　　　　　　　　 C. Classmates.

　　 8. Who is John?

A. The boss of the two speakers.

B. The teacher of the two speakers.

C. The colleague of the two speakers.

9. Why does the man say goodbye to the woman?

A. To go home.　　　　　　 　　 B. To help John.　　　　　 　　　 C. To finish his work.

Conversation 5

10. How many kinds of communication are mentioned?

A. 3.　　　　　　　　　 　　　　 B. 4.　　　　　　　　　　 　　　　　　　 C. 5.

11. What is true about mails according to the conversation?

A. It is the cheapest means of communication.

B. It is the most personal means of communication.

C. It has almost been given up by modern people.

12. What is the second kind of communication?

A. Mails.　　　　　　　　　 　　 B. Computers.　　　　　　 　　　 C. Telephones.

Conversation 6

13. What does the man think of the movie?

A. Absurd.　　　　　　　　 　　　 B. Fantastic.　　　　　　　 　　 C. Exciting.

14. Which character is accepted by the two speakers?

A. The captain.

B. The communications officer.

C. The doctor.

15. What kind of movie is this?

A. Comedy.　　　　　　　　 　　 B. Science fiction.　　　　 　　　　　　　 C. Tragedy.

SECTION B

Directions: In this section, you'll hear a mini-talk. Listen carefully and then fill in the numbered blanks with the information you’ve got. Fill in each blank with NO MORE THAN 3 WORDS. You’ll hear the mini-talk TWICE.

Protect Your Car from Being Stolen

First-Lock the car and make sure　 16　 are closed when you leave it. Even a tiny　　　　　 gap allows a thief to insert(插入) a wire to press the lock button. And don' t put a spare key inside or outside the car.

Second-Dusk to mid-evening are the　 17　 for car theft, so you' d better park in a well-lit area. Avoid giving your keys to the parking-lot attendant.

Third-Keep your　 18　 and registration in your wallet or purse. You should also have a record of your car' s 　19　

Last-It' s a good idea to install some kind of　 20　 . Thieves don't want to waste time on trying to steal a protected car.

(五)问题和讨论：

实验完成后，老师评议说：按上述实验设计，即使C中反应完全，D中吸收完全，也不会得出正确的结果。经讨论，有同学提出在B与C之间加入一个装置。再次实验后，得到了较正确的结果。那么，原来实验所测得的铜的质量分数偏小的原因可能是　　　　　　　　　　　　　　 。在B与C之间加入的装置可以是　　　　　　　　 ，其中盛放的药品是　　　　　　　　 。

-8-

2010年全国初中学生化学素质和实验能力竞赛

(四)计算：样品中铜的质量分数＝　　　　　　　　 (用含W、m₁、m₂的代数式表示)

(三)实验内容：

(二)实验用品：

仪器：天平、分液漏斗、锥形瓶、硬质玻璃管、干燥管、酒精灯、洗气瓶等。

药品：红褐色(含炭)样品、过氧化氢溶液、二氧化锰、碱石灰(固体氢氧化钠和氧化钙的混合物)、浓硫酸等。

(一)实验目的：　　　　　　　　　　　　　　　　　　　　　　　　 。

31．(6分)为了将混有硫酸钠、碳酸氢铵(不稳定，受热易分解生成氨气、二氧化碳和水)的氯化钠提纯，并制得纯净的氯化钠溶液，某同学设计的实验流程如下：

试回答下列问题：

(1)操作②能否用硝酸钡溶液？说明理由_______________________________________。

(2)进行操作②后，如何判断SO已除尽，方法是______________________________

____________________________________________________________________________。

(3)操作③的目的是_________________________；为什么不先过滤而后加碳酸钠溶液，其理由是____________________________________________________________________。

(4)此设计方案是否严密，说明理由_____________________________________________。

32．(14分)某课外活动小组加热炭粉(过量)和氧化铜的混合物，再用下图所示装置，对获得的铜粉(含炭)样品进行实验。图中铁架台等装置已略去。请你帮助他们完成下列实验报告。