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
At what point in the semester does this talk take place?
At what point in the semester does this talk take place?
admin
2011-03-01
63
问题
At what point in the semester does this talk take place?
Good afternoon. My name is Mary Raffety. For the next eleven weeks, I will be your lab instructor. The lab experiences you will be having are designed to complement your work in Dr Kaplan’s inorganic chemistry course. Today’s experiment is purposely a short one; it will help you become familiar with the lab setup and equipment.
As your lab instructor, it is my duty to assist you in setting up your experiments and understanding your results. I will also grade your lab notebooks. But I have an even more basic responsibility: your physical safety. I will insist on proper precautions, such as wearing protective goggles at all times. I also expect you to use common sense: don’t wear long scarves that might catch fire; don’t smoke; don’t taste unknown substances.
Let me reinforce this point with a story. Issac Newton, perhaps the greatest scientist of all ages, lived in a period when the toxic effects of chemicals were less understood than today. He routinely sniffed fumes, tasted chemicals, and used open containers for heating substances. In the early 1690s, he suffered through a period of insomnia, depression, and mental instability. Though his biographers linked this situation to problems in his personal life, researchers now think it was a consequence of his lab procedures; they found abnormally high concentrations of lead, mercury, and other heavy metals in preserved specimens of his hair.
Consequently, we must learn from the past and put safety first.
选项
A、To illustrate what a great scientist he was.
B、To explain why lab equipment must be cleaned carefully.
C、To emphasize the need for proper precautions.
D、To show how theoretical chemistry has advanced.
答案
C
解析
独白第三段第一句即指出以牛顿为例的目的是为了reinforce this point,也就是强调前面所涉及的安全问题,故答案是[C] 。
转载请注明原文地址:https://kaotiyun.com/show/GFjd777K
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
Wheredoestheconversationmostprobablytakeplace?
ReadthetextwhichisaboutthefiveboroughsofNewYorkCity.ForQuestions61to65,matchthenameofeachboroughtoone
Finishingteacher’sevaluationsneedmaturityandobjectivity.Everysemesterwehavetheopportunitytoevaluateourinstructor
Inmanybusinesses,computershavelargelyreplacedpaperwork,becausetheyarefast,flexible,anddonotmakemistakes.Asone
Forsometimepastithasbeenwidelyacceptedthatbabies--andothercreatures--learntodothingsbecausecertainactsleadto
Forwhatreasondidthefarmergotoseeadoctorinthetown?
Howmanycoursesdidthewomantakelastsemester?
Atwhatpointinthesemesterdoesthistalktakeplace?
Whoisthevisitor?
StandingontherimoftheGrandCanyon(大峡谷),gazingacrossthisgiantwouldintheEarth’ssurface,avisitormightassumethat
随机试题
常用的解决不确定型决策问题的方法有()
某合伙企业原只有甲、乙两个合伙人,后经甲、乙一致同意,丙成为新的合伙人。在丙加入之前,合伙企业对丁有10万元的债务。现该债务到期,合伙财产又不足以清偿债务,则丁可以请求偿还债务的是()
丙酮酸脱氢酶复合体中转乙酰化酶的辅酶是
精囊腺正确的描述是
患儿,女,2岁。形体消瘦,面色少华纳差,大便溏,每日2~3次,舌淡苔少。查体:体重9kg,皮肤黏膜苍白,心、肺(-),腹壁皮下脂肪0.45cm。诊断为营养不良,其程度及证型是()
在人口稠密区,强噪声作业应停止施工的时段一般为()。
下列选项中关于基数效用论和序数效用论说法正确的有()。
ActressLisaRoss-EllisfiledalawsuitagainstTheEntertainmentFilesmagazineoverfalse______madeintheirNovemberissue.
TheagreementisoverseenbytheCommitteeonAgriculturewhichreviewsprogressintheimplementationofcommitments,andisre
"Congratulations,Mr.Jones,it’sagirl."Fatherhoodisgoingtohaveadifferentmeaningandbringforthadifferentrespo
最新回复
(
0
)