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
9
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] 【M9】
选项
答案
notice一noticed
解析
(此处讲述的是1928年青霉素的发现,因此句子应当用过去时态,故把notice改为noticed。)
转载请注明原文地址:https://tihaiku.com/zcyy/3709211.html
相关试题推荐
Perhapsoneofthemosttragicmastersofart,VanGogh,yearned______recognitio
It’samazingthattworesearchersworkingindependentlymadethesamediscovery
WhileworkingonacaseDrWatsonaccidentallyfelldowna30ftdrywishingwell
WhileworkingonacaseDrWatsonaccidentallyfelldowna30ftdrywishingwell
WhileworkingonacaseDrWatsonaccidentallyfelldowna30ftdrywishingwell
WhileworkingonacaseDrWatsonaccidentallyfelldowna30ftdrywishingwell
Warning;Poisonous!Ifaccidentallyswallowed,______vomitingatonceandseekme
Perhapsoneofthebest-knownaccidentaldiscoveryisSirAlexander【M1】____
Perhapsoneofthebest-knownaccidentaldiscoveryisSirAlexander【M1】____
Perhapsoneofthebest-knownaccidentaldiscoveryisSirAlexander【M1】____
随机试题
主动脉压与肺动脉压的区别是A.肺动脉平均压稍低于主动脉压 B.肺动脉压平均压高
基坑开挖完毕后,必须参加现场验槽并签署意见的单位有()。(2013) A、
下列关于消防水泵串联和并联的说法,不正确的是()。A.消防水泵的串联宜采用相同
二孩政策使得托儿所、幼儿园人数增加,你作为教育部的工作人员要做一个调研报告,你会
1956年召开的中共八大通过的政治报告指出我国国内的主要矛盾是A.工人阶级同民族
客户在期货交易中违约造成保证金不足的,期货公司应当以( )垫付。A.其他客户资
陈某抢劫出租车司机甲,用匕首刺甲一刀,强行抢走财物后下车逃跑。甲发动汽车追赶,在
共用题干 一般资料:求助者,男性,42岁,硕士研究生,公司高级管理人员。案例介
患者女性,25岁,左臂被玻璃划伤2h来急诊。查体发现左前臂伸侧一长约4cm伤口,
一侧节段性分离感觉障碍+即痛温觉障碍而触觉及深感觉保留,病变部位在() A.同
最新回复
(
0
)