首页
登录
职称英语
Perhaps one of the best-known accidental discovery is Sir Alexander 【M1】____
Perhaps one of the best-known accidental discovery is Sir Alexander 【M1】____
游客
2024-08-07
36
管理
问题
Perhaps one of the best-known accidental discovery is Sir Alexander 【M1】______
Fleming’s discovery of penicillin. In 1922 Fleming accidentally discovered
an antibiotic that killed bacteria but not white blood cells . While suffering 【M2】______
from a cold, Fleming made a culture from some of his own nasal secretions.
As he examined the culture dish, filling with yellow bacteria, a tear fell from his 【M3】______
eye into the dish. The next day when he examined the culture, he found a clear
space which the tear had fallen. His keen observation and inquisitiveness led 【M4】______
him to the correct conclusion: the tear contained a substance that caused rapid
destruction of the bacteria, but was harmless to human tissue. The antibiotic
in the tear he named lysozyme. It turned to be of little practical importance, 【M5】______
because the germs that lysozyme killed were relatively harmless, and this discovery 【M6】______
was an essential prelude to this of penicillin, as we shall see. 【M7】______
In 1928, Fleming was doing a research on influenza. While carrying out some 【M8】______
routine laboratory work that involved microscopic examination of cultures of
bacteria growth in petri dishes(flat glass dishes with covers), Fleming notice in 【M9】______
one dish an unusual clear area. Examination showed that the clear area surrounded
a spot where a bit of mould had fallen onto the dish, which had been left
uncovered. Remembering his experience with lysozyme, Fleming concluded that
the mould was producing something that was dead to the Staphylococcus bacteria 【M10】______
in the culture dish. Fleming isolated the mould and identified it as belonging to
the genus Penicillium, and he named the antibiotic substance it produced penicillin. [br] 【M10】
选项
答案
dead—deadly
解析
(根据上下文可知,此处指“这种霉菌会产生一种对葡萄球细菌来说致命的物质”,因此应当把dead“死亡的,去世的”改为deadly“致命的;极具破坏性的”。)
转载请注明原文地址:https://tihaiku.com/zcyy/3709212.html
相关试题推荐
Perhapsoneofthemosttragicmastersofart,VanGogh,yearned______recognitio
TennisstarChrisEvert,whoretiredfromthegameaftereighteenyears,perhaps
WhileworkingonacaseDrWatsonaccidentallyfelldowna30ftdrywishingwell
TennisstarChrisEvert,whoretiredfromthegameaftereighteenyears,perhaps
WhileworkingonacaseDrWatsonaccidentallyfelldowna30ftdrywishingwell
Warning;Poisonous!Ifaccidentallyswallowed,______vomitingatonceandseekme
Perhapsoneofthebest-knownaccidentaldiscoveryisSirAlexander【M1】____
Perhapsoneofthebest-knownaccidentaldiscoveryisSirAlexander【M1】____
Perhapsoneofthebest-knownaccidentaldiscoveryisSirAlexander【M1】____
Perhapsoneofthebest-knownaccidentaldiscoveryisSirAlexander【M1】____
随机试题
•Youwillhearfiveshortrecording.•Foreachrecording,decidewhatthespeake
Jane______assoonassherecognizeditwasherformerboyfriend’svoice.A、cal
[originaltext]Manychangesaretakingplaceinthewayinwhichmenandwom
[originaltext]W:DonnyDeutschsaysthekeytosuccesswasaskingonesimplequ
Iaminterestedinthetrainingcourse,which______atHiltonHotelinBeijingf
填入问号处最恰当的是 A.如上图所示 B.如上图所示 C.如上图所示
医学科研的根本目的是()A.寻找诊治疾病的有效途径 B.揭示生命活动的
下列哪一种胰岛素制剂的作用时间最长:()A.珠蛋白锌胰岛素 B.普通胰
某男,75岁。患消渴病20余年,尿频量多,饮一溲一,口干舌燥,耳鸣,腰膝酸软,畏
由于工程建设的需要,施工企业甲需经过乙公司内部的道路运送建筑材料,甲乙之间订立合
最新回复
(
0
)