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
33
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] 【M1】
选项
答案
discovery-discoveries
解析
(该句提到“one of”,可知此处应当用名词复数discoveries,指“著名的偶然发现之一”。)
转载请注明原文地址:https://tihaiku.com/zcyy/3709203.html
相关试题推荐
Youaretryingtofillabathwithbothtapson,buthaveaccidentallyleftout
It’samazingthattworesearchersworkingindependentlymadethesamediscovery_
Youaretryingtofillabathwithbothtapson,buthaveaccidentallyleftout
WhileworkingonacaseDrWatsonaccidentallyfelldowna30ftdrywishingwell
WhileworkingonacaseDrWatsonaccidentallyfelldowna30ftdrywishingwell
WhileworkingonacaseDrWatsonaccidentallyfelldowna30ftdrywishingwell
WhileworkingonacaseDrWatsonaccidentallyfelldowna30ftdrywishingwell
Perhapsoneofthebest-knownaccidentaldiscoveryisSirAlexander【M1】____
Perhapsoneofthebest-knownaccidentaldiscoveryisSirAlexander【M1】____
Perhapsoneofthebest-knownaccidentaldiscoveryisSirAlexander【M1】____
随机试题
IreturnedtoAbuja,thecapitalofNigeria,aftercollegegraduation.Ihad
Weallknowthatitispossibleforordinarypeopletomaketheirhomeso
Drivestraightahead,andthenyouwillseea_______totheShanghai-NanjingE
Owningacatcanreducetheriskofheartattacksandstrokesbymorethana
公共场所是A.公众从事各种社会活动的临时性生活环境 B.公众从事各种社会活动的
为预防牙周疾病,健康人应定期做牙周洁治,以下时间哪项是最适宜的A.每2~3个月做
能够与亚硝酸钠发生重氮化,并与碱性β-萘酚显猩红色的是A.环丙沙星B.甲氯芬酯C
某房地产开发企业欲取得一宗以挂牌方式出让的建设用地使用权,委托房地产估价机构评估
某男,39岁。肢体关节、肌肉酸楚,重着,疼痛,肿胀散漫,关节活动不利,肌肤麻木不
某建设工程迹地位于华南低山区,雨量充沛。按植被分布特征判断,自然状态下多年后可能
最新回复
(
0
)