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
2023-10-13
21
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/3094594.html
相关试题推荐
Perhapsalmosteveryonehasanexperienceofhavingfeltletterafterli
Perhapsalmosteveryonehasanexperienceofhavingfeltletterafterli
Youaretryingtofillabathwithbothtapson,buthaveaccidentallyleftout
Ifthisisa"Mandelamoment"forAmerica,therewere—perhapsinevitably—few
Ifthisisa"Mandelamoment"forAmerica,therewere—perhapsinevitably—few
Ifthisisa"Mandelamoment"forAmerica,therewere—perhapsinevitably—few
Ifthisisa"Mandelamoment"forAmerica,therewere—perhapsinevitably—few
Youaretryingtofillabathwithbothtapson,buthaveaccidentallyleftout
Whatisthenewdiscoveryabout?[br][originaltext]Otypebloodcanbetransfu
Whatisthenewdiscoveryabout?[br][originaltext]Otypebloodcanbetransfu
随机试题
We’ll______youforanydamagedonetoyourhousewhileweareinit.A、compensa
[originaltext]W:Excuseme.Isthisseattaken?M:No,it’snottaken.Doyouw
Fortheadvertisedposition,thecompanyoffersa(n)_________salaryandbenefit
[originaltext]M:Ineedtousemorethanjustmymathskillsforthesequestion
用于维持社会秩序和保卫国家安全,不使其受到国内外敌对力量的破坏和侵犯,以保障人民
凯恩斯主义认为,货币政策的传导变量是()。A.基础货币 B.超额储备 C.利
地下水对混凝土建筑物的腐蚀是一项复杂的物理化学过程,在一定的工程地质条件下,对建
测量石料试样单轴抗压强度时连续均匀地加荷,加荷速度取每秒钟()。 A.(0
共用题干 SquishyCellphonesAddaBuzztoC
涵洞的附属工程包括()。A.锥体护坡 B.河床铺砌 C.人工水道 D
最新回复
(
0
)