首页
登录
职称英语
[img]2012q1/ct_etoefm_etoefspeakc_1287_20121[/img] Now listen to part of a l
[img]2012q1/ct_etoefm_etoefspeakc_1287_20121[/img] Now listen to part of a l
游客
2024-01-04
24
管理
问题
Now listen to part of a lecture in a general science class. The professor is discussing the way that ultrasound works.
Question
Using the main points and examples from the lecture, describe the kind of information that ultrasound can provide, and then explain the way that ultrasound is used in medical diagnosis.
Preparation Time: 20 seconds
Recording Time: 60 seconds
Narrator 2: Number 6. Listen to part of a lecture. Then listen for a question about it. After you hear the question, you have 20 seconds to prepare and 60 seconds to record your answer.
Narrator 1: Now listen to part of a lecture in a general science class. The professor is discussing the way that ultrasound works.
Professor:
Okay, let’s talk about how ultrasound works, and how it’s used in medical diagnosis. To make a long story short, ultrasound is very similar to the sonar devices we discussed last week. Remember the system that emits ultrasonic pulses and listens for reflected pulses from objects in the ocean? Well, ultrasound is really just another type of sonar. The sound waves used in the ultrasound are created by a crystal that moves rapidly back and forth, creating a sound, but you can’t hear it because the frequency is so high. The doctor places the device, the transmitter that sends out the sound waves...the doctor puts that on the surface of the skin so the sound waves are transmitted inside the body. And when this high-frequency sound is directed to a particular area, then the tissue and organs reflect the sound. The patterns of sound that are reflected are processed by a computer, and an image appears on the screen.
And that tells the doctor whether there is something unusual there or not. This is very important in the diagnosis of cancer...to know whether a tumor is present...and also as a noninvasive way to
monitor the growth of a fetus during pregnancy.
Narrator 1: Using the main points and examples from the lecture, describe the kind of information that ultrasound can provide, and then explain the way that ultrasound is used in medical diagnosis.
Narrator 2: Please prepare your answer after the beep.
Beep
[Preparation time: 20 seconds]
Narrator 2: Please begin speaking after the beep.
Beep
[Recording time: 60 seconds]
Beep
选项
答案
Responses will vary.
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3333819.html
相关试题推荐
SECTION1Questions1-10Questions1-3Listentothetelephoneconversationbe
[img]2012q1/ct_eilm_eillist_0031_20121[/img][br][originaltext]ADVISOR:Isthe
[img]2012q1/ct_eilm_eillist_0017_20121[/img][br][originaltext]Okay,nowg
[img]2012q1/ct_eilm_eillist_0017_20121[/img][br][originaltext]Okay,nowg
[img]2012q1/ct_eilm_eillist_0017_20121[/img][br][originaltext]Okay,nowg
[img]2012q1/ct_eilm_eillist_0399_20121[/img][br][originaltext]IfI’vepersuad
[img]2012q1/ct_eilm_eillist_0399_20121[/img][br][originaltext]IfI’vepersuad
[img]2012q1/ct_eilm_eillist_0399_20121[/img][br][originaltext]IfI’vepersuad
[img]2012q1/ct_eilm_eillist_0399_20121[/img][br][originaltext]IfI’vepersuad
[img]2012q1/ct_eilm_eillist_0339_20121[/img][br][originaltext]DAWN:We’vecha
随机试题
Thefirsttwostagesinthedevelopmentofcivilizedmanwereprobablytheinven
Comparisonsweredrawnbetweenthedevelopmentoftelevisioninthe20thcen
[originaltext]M:Secondthingyoujustmentionedinnetworking,forthosekids
HealthMinisterNicolaRoxon’slatestproposalthatpatientsbeallocatedto
Hegaveaboringspeechfullof______jokessothatmanystudentsfellasleepin
命题甲:lgx,lgy,lgz成等差数列;命题乙:y2=x·z则甲是乙的()A.
使用Access创建的“图书”数据表,其设计视图的部分界面如图所示。下列说法正确
GIS设备在耐压过程中发现毛刺放电现象,只要信号高于标准值,应进行处理。
监理人为了便于工程进度管理,可以要求承包人在合同进度计划的基础上编制并提交分阶段
用于装饰的板材按反光率分为()。A.镜面板 B.无机涂层板 C.亚光板
最新回复
(
0
)