首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、To discuss the results of the lab experiment. B、To answer Bob’ s question about the lab experiment. C、To explain the method of
A、To discuss the results of the lab experiment. B、To answer Bob’ s question about the lab experiment. C、To explain the method of
admin
2010-09-10
78
问题
S: Let’s talk about the results of your laboratory? experiment. Did you have any problems with it?
B: Yes, Professor Smith. We did.
S: Who’s your lab partner, Bob?
B: Anne Wilson.
S: Well, Anne, can you and Bob go over the procedure for the class?
A: Sure. Firs( we put ten grams of crushed limestone in a bottle.
S: Anything special about the bottle?
B: It was a gas - collecting bottle with a one - hole stopper and bent glass tubing.
S: Very good. So you put the limestone in a gas - collecting bottle. Then what?
A: Then we poured in ten milligrams of hydrochloric acid, put on the stopper, and collected a bottle of carbon dioxide.
S: Right, What was the method of collection?
A: Water displacement.
S: Good.
A: Then, we lit a magnesium ribbon and put it in the bottle or carbon dioxide.
B: And carbon deposits began to form on the bottom of the bottle, You see, we didn’t have any problem with procedure.
A: Well, we had a little problem getting the magnesium ribbon to stay lit until we could get it into the bottle.
B: Okay. But we did it. The big problem was that we really didn’t understand what happened. Did the magnesium combine with the oxygen in the carbon dioxide?
S: You have just answered your own question, Bob. The burning magnesium broke the carbon - oxygen bonds in the carbon dioxide, and then the oxygen combined with the magnesium to produce magnesium oxide.
A: And the carbon was freed to deposit itself on the bottle.
S: Exactly.
选项
A、To discuss the results of the lab experiment.
B、To answer Bob’ s question about the lab experiment.
C、To explain the method of collection by water displacement.
D、To prepare the students to do the lab experiment.
答案
A
解析
此类题目首先一定要听明白大概的意思,听的时候注意关键词,依据会话中“Let’s talk about the results of your laboratory experiment.”可以看出A为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/aC87777K
0
大学英语四级
相关试题推荐
Forthispart,youareallowed30minutestowriteacompositiononthetopicStudentsComplaints.Youshouldwriteatleast120
A、Shewillhelpthemanlater.B、Shedoesn’twanttohelphimwiththehomework.C、Themanshoulddothehomeworkhimself.D、The
Manysuccessfulbusinessexecutivesdonotfollowthestandardmethodforproblemsolvinginbusiness.Typically,businessschoo
WhatdoesthespeakersayaboutColonelHarlandSanderswhenheretired?
Inthisnewera,thesinglemostimmediateandmostseriouschallengetoAmericatraditionalidentitycomesfromtheimmenseand
A、Tellingjokes.B、Fallingasleepduringclass.C、Stayinglateafterclass.D、Eatinginthecafeteria.C题目问女士最近形成了什么习惯。女士提到她的政治学
A、Givingalecture.B、Discussingpoliticalscience.C、Workingonascienceproblem.D、Readingtwentieth-centuryliterature.D题目问
TheInternetcanmakethenewsmoredemocratic,givingthepublicachancetoaskquestionsandseek【C1】______factsbehindstori
TheInternetcanmakethenewsmoredemocratic,givingthepublicachancetoaskquestionsandseek【C1】______factsbehindstori
A、Alicedidn’tseemtobenervousduringherspeech.B、Aliceneedsmoretraininginmakingpublicspeeches.C、Themancanhardly
随机试题
二十四節気「立夏」眩い陽差しに草木の緑が輝き、爽やかな風が吹くころ、一年で最も清々しい季節の到来です。ゴールデンウィ一クのまっただ中、本日5月5日は端午の節句こどもの日。二十四節気では「立夏(りっか)」となり、梅雨の二歩手前、しばし訪れる爽快な青
SCA7的特点是
女孩,16岁,13岁初潮,月经周期不规律,7~15/35~65天,每次经量较多,一般用卫生巾2~3包,疲乏消瘦,面色黄白,学习紧张倍感劳累。基础体温呈单相。治疗原则是
常用的亲和层析技术是利用的抗原抗体反应的哪种特点
代理人承担违约责任的行为有()。
我国公共财政改革的核心内容是()。
培训课程开始前应做好后勤准备工作,确认()。[2010年5月三级真题]
我有机会研究了英、法、德诸国中世纪政治制度。随着研究的深入,我十分惊讶地看到,所有这些法律之间存在着惊人的相似之处,尽管各个民族彼此不同,很少融合,却有着如此相似的法律,这不能不使我为之赞叹。由于地点不同,这些法律在细节上出现不断的、无止境的变化,但是它们
下雨:泥泞
BSP的主要目标是提供一个信息系统规划,用以支持企业短期和长期的信息需求对于下面列出的目标Ⅰ.为管理者提供一种形式化的、客观的方法,明确建立信息系统的优先顺序,不应考虑 部门的狭隘利益,并避免主观性Ⅱ.为具有较长生命周期系统的建设、保护系统的投资做准
最新回复
(
0
)