topicntence

topicntence主题句

LookingfortheTopicSentence

Moreoftenthannot,onentenceinaparagraphtellsthereaderexactlywhatthesubjectoftheparagraphisandthusgives

icntencestatesbrieflyan

ideawhofullmeaningandsignificancearedevelopedbythesupporting?ppearatthebeginning,orinthe

middle,orattheendofaparagraph.

Sample1:Atthebeginning

London'ainveraltimes?a?day;eachtimetherainmaycomesuddenlyafterthesunis

?oneMarchafternoononHamptonHeathlastyearitrained

threetimes,therewasonehail(冰雹)storm,andthesunshonebrilliantly-?-?all?thiswithintwohours'tunusual

toemenandwnowswhatthe

nextfewmomentswillbring.

(ThemainideainthisparagraphisLondon'otherntencesillustratethe?idea?with

supportingdetails.)

Sample2:Inthemiddle

JustasIttledowntoreadorwatchtelevision,?get?a?telephonecall,?he?screams

in?shavetohangupto?findoutwhat'-sittingwith

yhe?wantshalfofwhatsoeverIhavetoeat.

Then,whenhefinallygrowstired,ittakesaboutanhourforhimtofallasleep.

(Allthedetailsarecitedinthisparagraph?tosupportthemainidea:Baby--sittingwithmylittlebrotherisnofun.)

Sample3:Attheend

Doctorsareoftheopinionthatmostpeoplecannotlivebeyond100years,butagrowingnumber?of?scientistsbelieve?that

remorethan12,000Americansover100yearsold,andtheirnumbersare

.?JamesLangleyofChicagoclaimsthat,theoreticallyandunder?idealconditions,animals,

includingman,canlive?six?timeslonger?n'speriodofgrowthlastsabout25

years.?If?Dr.?Langley'stheory?is?accurate?,?futuregenerationscanexpectalifespanof150years.

laceatopicntenceatboththebeginning

ntellareaderthattheideainthisparagraphismoreimportantthanotherideasfoundin

otherparagraphs.

Sample4:Atboththebeginningandend

sofexpressinggoodmannersaredifferentfromcountrytocountry.

Americanat?withknivesandforks;anssay"Hi"whentheymeet;Japanebow.

ManyAmerican?menopen?doors?forwomen;urface,??itappears?that?goodmannersin

AmericaarenotgoodmannersinJapan,nycountry,theonlymannersthatareimportantare

thoinvolvingoneperson'ountriesitisgoodmannersto?behaveconsiderately?

toward?others?and?lythewayofbehaving?politely?thatdiffersfromcountrytocountry.

(Thisparagraphbeginswith?a?topic?ntence?andendswitharestatementofthesametopicntence.)