What does the passage mainly discuss? The word "it" in line 18 refers to

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问题 What does the passage mainly discuss?
The word "it" in line 18 refers to

选项 A、oxygen
B、battery
C、wire
D、current

答案C

解析

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托福（TOEFL）

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What does the passage mainly discuss? The word "it" in line 18 refers to

托福（TOEFL）

EarlyoccupationsaroundtheriverThamesAInherpioneeringsurvey,SourcesofLondonEnglish,Laura

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ChooseTWOletters,A-E.Writethecorrectlettersinboxes7and8onyouranswersheet.WhichTWOpositivefunctionsaboutMin

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Completetheformbelow.WriteNOMORETHANTHREEWORDSAND/ORANUMBERforeachanswer.ExampleAnswerAim:protectinge

Choosethecorrectletter,A,BorC.Whatwasthemostdifficultproblemwhenthecompanywasfounded?

Completethesentencesbelow.WriteONEWORDONLYforeachanswer.FootballintheUKFootballbecamepopularanditisregarde

Choosethecorrectletter,A,BorC.Whencanpatientsmeetthefemaledoctor?

LaughterThenatureoflaughterlaughterisa【L31】________process—involvesmovementandsounditiscontrolledbyour【

GeorgeWashingtonCarver______internationalfameforrevolutionizingagricultureresearchinthesouthernUnitedStatesduring

#include＜stdio.h＞intf(t)intt；{intx；if(t＜=1)x=1；elsex=t*f(t-1)；returnx；}main()

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Themajorityofnursesarewomen,butinthehigherranksofthemedicalprofessionwomenareina______.

女性，45岁，双侧颊黏膜反复糜烂，疼痛不适，进食时加重，组织病理检查结果为上皮过度不全角化，基底细胞液化变性，固有层淋巴细胞带状浸润，最可能的诊断是

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