第二节 听取信息

听下面一段对话，请根据题目要求，从所听到的内容中获取必要的信息，填入答题卷标号为16~20的空格中。听录音前，你将有10秒的阅题时间。录音读两遍，你将有60秒钟的作答时间。

When is Mary leaving?	16.________December 20th.
What time will the plane arrive in New York?	17. ________local time.
How long does Mary have to wait in Tokyo?	She has to wait for 18.________in Tokyo.
What is the exact fare?	19.____________
Why is the ticket rather expensive?	It’s 20.____________

第一节 听力理解(5段共15小题；每小题2分，满分30分)

每段播放两遍，各段后有几个小题，各段播放前有5秒钟的阅题时间。请根据各段播放内容及其相关小题，在5秒钟内从题中所给的A B C 项中，选出最佳选项，并在答题卡上将该项涂黑。

听第一段对话，回答第1~3 题

1. How much do the woman’s parents pay each semester(学期)?

　A. $15000　　　　 B. $10000　　　 C. $ 2000

2. Where does she take a part-time job?

　A. At a hotel 　　　　　B. At the college.　　 C. At a restaurant

3. How does the woman try to save money?

　A. She uses a cell phone　　 B. She buys a lot of clothes　　　 C. She sticks to her budget

听第二段独白，回答第4~6题

4. What have the doctors long known?

A. Common sounds at home are not harmful to the ear.

B. Hearing damage or loss can be caused by sounds of all kinds.

C. A terribly loud noise can make a person deaf for some time or all his life.

5. What does this passage suggest?

　A. Hearing will be damaged even if a person has heard a loud noise for less than one second.

　B. Hearing will be damaged even if a person has heard a loud noise for only little than one second.

　C. Hearing will not be damaged if a person has little more than one second to get ready

6. What can you learn about aspirin(阿斯匹林) from the passage?

　A. Aspirin increases hearing loss by two times.

　B. Aspirin can damage one’s hearing when it is given more than four grams daily.

　C. Aspirin can make hearing damage from loud noise worse.

听第三段对话，回答第7~9题

7. When did the woman prepare for her final examinations?

　A. About a year ago　　　　 B. About five years ago　　　　 C. About nine years ago

8. Why does the woman want to open a book cafe?

　A. To have a different lifestyle.

　B. To make more friends.

　C. To own her study room.

9. What kind of place does the woman want her book cafe to be?

　A. A quiet library　　　　　 B. A business center　　　　 C. A relaxing place

听第四段对话，回答第10~12题

10. Where are Ada’s family going to spend summer?

　A. Italy　　　 B. Portugal　　　　　 C. Spain

11. What is essential to Ada about a hotel?

　A. It should be on the beach.

　B. It should have a swimming pool.

　C. It should be in the downtown.

12. What does the ad talk about the price of the hotel?

　A. It has been cut down by half.

　B. It is affordable.

　C. It is lower than that in other hotels.

听第五段独白，回答第13~15题

13. What does the speaker want to draw the listener’s attention to when he mentions the villages in developing countries?

　A. Lack of electricity　　　　 B. Shortage of experts　　　　　 C. Lack of clean water

14. What is an expert system?

　A. A group of experts who can provide professional advice.

　B. A computer program which can provide professional advice.

　C. A system which trains computer experts.

15. Which of the following statements is true?

　A. It is not easy to see the shortage of experts in the villages.

　B. Many doctors and engineers are sent to the villages to make up for the shortage of experts.

　C. Expert medical systems are widely used in developing countries.

12.(14分)某雷达站正在跟踪一架向雷达站飞来的飞机，在某一时刻从雷达站发出无线电波到接收到飞机反射的无线电波历时t₁＝2.00×10^－4 s；经Δt＝10 s后，从雷达站发出无线电波到接收到飞机反射的无线电波历时t₂＝1.86×10^－4 s.求该飞机的速度大小.

解析：设飞机在某一时刻距离雷达的位移为s₁，则：

s₁＝＝3.00×10⁴ m

设飞机在10 s后距离雷达的位移为s₂，则：

s₂＝＝2.79×10⁴ m

飞机的速度v＝＝210 m/s.

答案：210 m/s

11.(17分)在“练习使用示波器”的实验中：

(1)为了观察亮斑在竖直方向上的偏移，应该将扫描范围旋钮置于“外X”挡，使亮斑位于屏的　　，然后，应把“DC－AC”开关置于“　　”位置，以备给示波器输入一个直流电压.

(2)为给示波器输入一个Y方向的直流电压(要求从零电压开始逐渐增加)，请将如图甲所示的器材与示波器连成正确的是电路.

(3)调节变阻器改变输入电压，可以看到亮斑向上的偏移随之改变，电压越高，向上的偏移越　　；调换电池正负极，改变输入电压，可以看到亮斑向　　偏移.

解析：(1)扫描范围旋钮置于“外X”时，机内不提供x方向的扫描电压，故亮斑仅出现在屏的中心；然后，应把“DC－AC”开关置于直流“DC”位置，以备给示波器输入一个直流电压.

(2)因输入电压要从零开始逐渐增加，所以示波器应接在分压电路上，所以实验时仪器连接应如图乙所示.

(3)若再加大Y向电压，则亮斑会加大其在竖直方向的位移，即电压越高，向上的偏移越大；调换电池正、负极后，亮斑向下偏移.

答案：(1)中央位置，DC　(2)如图所示　(3)大，下

10.(15分)示波器的“Y输入”端内阻很大，用它测量电压对被测电路的影响很小.图示为示波器测电压的示意图，假设各旋钮经调节后，示波器显示屏上纵坐标为0.50伏/格，横坐标借助标准信号源将它校准为1毫秒/格，则图中被测正弦式交变电流的电压最大值为　　V，频率为　　Hz.

假设将衰减旋钮从“100”调至“1000”，则显示屏上波形纵向将　　为原来的，横向将　　(填“变大”、“不变”或“变小”)，这时可通过调节　　旋钮使波形纵向适当恢复.

答案：1.5　250　变小　不变　Y增益

9.德国《世界报》曾报道个别西方国家正在研制电磁脉冲武器即电磁炸弹.若一枚原始脉冲功率为10千兆瓦、频率为5 kHz的电磁炸弹在不到100 m的高空爆炸，它将使方圆400 km²-500 km²范围内的电场强度达到每米数千伏，使得电网设备、通信设施和计算机的硬盘和软盘均遭到破坏.电磁炸弹有如此强大的破坏力的主要原因是(　)

A.电磁脉冲引起的电磁感应现象

B.电磁脉冲产生的动能

C.电磁脉冲产生的高温

D.电磁脉冲产生的强光

解析：导体接收电磁波就是电磁感应的过程.

答案：A

非选择题部分共3小题，共46分.

8.有两部手机A和B，A的号码为12345678900，B的号码为12345678901.当用手机A(或B)拨打B(或A)的号码时，既能听到手机B(或A)的叫声，又能看到B(或A)的显示屏上显示出A(或B)的号码.现将手机A放到一个透明的玻璃罩内，并将其内部抽成真空，再用手机B拨打号码12345678900，则下列说法正确的是(　)

A.既能听到A的叫声，又能看到A的显示屏上显示出12345678901

B.能听到A的叫声，但不能看到A的显示屏上显示出12345678901

C.不能听到A的叫声，但能看到A的显示屏上显示出12345678901

D.既不能听到A的叫声，也不能看到A的显示屏显示出号码

解析：A能接收呼叫信号，故显示屏显示12345678901，但由于处在真空中，故喇叭不能形成声波.

答案：C