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
66
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] 【M7】
选项
答案
this—that
解析
(此处指“关于溶解酵素可杀死细菌的发现,对后来发现青霉素奠定了重要基础”,应当用that指代上文提到的内容,文中指代discovery。)
转载请注明原文地址:http://tihaiku.com/zcyy/3094591.html
相关试题推荐
Whatisthenewdiscoveryabout?[originaltext]Otypebloodcanbetransfusedsa
Perhapsalmosteveryonehasanexperienceofhavingfeltletterafterli
Perhapsalmosteveryonehasanexperienceofhavingfeltletterafterli
Perhapsalmosteveryonehasanexperienceofhavingfeltletterafterli
Youaretryingtofillabathwithbothtapson,buthaveaccidentallyleftout
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
Afterthreedaysofstayingawake,PeterTripp,aNewYorker,begantoshow
Readthetextbelowabouttipsonbusinessnegotiation.Inmostofthel
W:Mywatchisnotworking.________M:It’stenpasttwenty.A、Whattimeisit?B
[originaltext]W:Ihaven’thadmuchexerciselately.Myonlyrecreationbasbee
YesterdayIstaredatthemapforalongtimeto______mymemoryoftheroute.A
0.0120的有效位数为()位。A.2 B.3 C.4 D.5
以下方剂组成中含有生地、阿胶的是A.当归补血汤 B.炙甘草汤 C.地黄
商业银行应至少每年对全部贷款进行一次分类。()
根据《期货从业人员执业行为准则(修订)》,期货从业人员不得以排挤竞争对手为目的,
下列哪项血清学检查对肝硬化的肝功能损害程度判断最有意义A.谷丙转氨酶 B.谷草
最新回复
(
0
)