人教版九年级全册Unit 6 When was it invented？同步练习（Section B）.doc

人教新版九年级全册《Unit6Whenwasitinvented？》2024年同步练习卷（SectionB）

一、阅读理解

1．Whatwasdiscoveredbyaccident？Theanswerispenicillin（青霉素）．Itkillsgerms．Bykillinggerms，itsaveslives．Supposeyouaresick．Yougotoadoctor．Sheexaminesyou．Shesaysyouhaveastaphinfection（葡萄球菌感染），thiswouldnothappen．Staphwasalmostsuredeath．

Everyonewantedmedicine．Theyworkedinthelabdayandnight，andtheygrewthestaphinsmallplatesandtriedtokillit，butnothingworked．

Thelaboratorydisheshadcoversonthem．Theykeptthingsfromfallingintodishes．Molds（霉菌）wereabigworry．Theyarealwaysintheair．Youcantseethem．Theyretoosmall．Therearethousandsofdifferentmolds．Moldscanmakeanexperiment（实验）fail．Thatswhydishesarecovered．

Dr．AlexanderFlemingwasworkingtokillthestaphgerm．Heworkedforyears．Onedayhetookacoveroffadish．Helookedinside．Therewasathickgrowthofstaphgerm．Therewasalsosomemol

d．Thenhesawsomethingstrange．Wherethemoldwas，therewasnogrowthofstaph．ThisiswhatFlemingprobablythought．Byaccident，Ifoundamoldthatkillthedreadedstaph．

Thisishowpenicillinwasfound．Butherestherealmiracle（奇迹）．Therearethousandsofkindsofmolds．Butonlyonekindcankillstaph．Themoldmusthavefallenintothedishafewdaysago.Thelidwasprobablyonlyopenforafewseconds，andrightthen

根据短文内容，选择最佳答案．

（1）Duringtheexperimentstofindamedicineforstaphinfections，．

A．thedisheswerenotcovered

B．staphandmoldwereputtogether

C．moldwaskeptinsmalldishes

D．staphwasgrowninsmalldishes

（2）Theworddreadedmeans．

A．famous

B．scary

C．healthy

D．endangered

（3）Thelastparagraphsuggeststhat．

A．accidentshappentoeveryone

B．thecarefulpersondoesnothaveaccidents

C．thecarelesspersonwillmissvaluablechances

D．luckisenoughwhendoingscientificexperiments

（4）Mostofthispassageiswrittenby．

A．tellinganunusualstory

B．showingtheresultsofexperiments

C．offering