Whenweanalyzethesaltsalinity(盐浓度)ofoceanwaters,wefindthatitvariesonlyslightlyfromplacetoplace．Nevertheless,someofthesesmallchangesareimportant．Therearethreebasicprocessesthatcauseachangeinoceanicsalinity．Oneoftheseisthesubtractionofwaterfromtheoceanbymeansofevaporation．Inthismanner,thesalinityisincreased,sincethesaltstaysbehind．Ifthisiscarriedtotheextreme,ofcourse,whitesaltwouldbeleftbehind;this,bytheway,ishowmuchofthetablesaltweuseisactuallyobtained． Theoppositeofevaporationisprecipitation,suchasrain,bywhichwaterisaddedtotheocean．Heretheoceanisbeingdilutedsothatthesalinityisdecreased．Thismayoccurinareasofhighrainfallorincoastalregionswhereriversflowintotheocean．Thussalinitymaybeincreasedbythesubtractionofwaterbyevaporation,ordecreasedbytheadditionoffreshwaterbyprecipitation． Normally,inhotregionswherethesunisverystrong,theoceansalinityissomewhathigherthanitisinotherpartsoftheworldwherethereisnotasmuchevaporation．similarly,incoastal． Grandma,whousedtoliveupstairs,isnowthevoiceonlongdistance,andtheworkingparentisfartoobeatendowneachdaytospendeveningrelaxationtimelisteningtothesandboxexperienceofaneagerfour-year-old． Sofamilyconversationisasextinctasmyoldtoysandparentalquestionssuchas"Whathaveyoubeendoing,Bobby?"havebeenreplacedby"I'mbusy,gowatchtelevision． AndwatchTVtheydo;countthembythemillions． Butit'susuallynotchildren'stelevisionthatchildrenwatch．Saturdaymorning,thechildren'shour,amountstoonlyabout8percentoftheirweeklyviewing． Wherearetheytobefound?Watchingadulttelevision,ofcourse,fromtheMatchGameinthemorning,totheafternoonatGeneralHospital,fromthemuggingsandbattlesontheeveningnewsrightthroughthefamilyhourandpastintoStarskyandHutch．That'swhereyoufindourkids,overfivemillionofthem,at10p．m．,notfewerthanamillionuntilaftermidnight!Allofthisisdonewithparentalpermission． Television,usedwell,canprovideenrichingexperiencesforouryoungpeople,butwemustuseitwithsomesense．Whenthecarpetisclean,weturnoffthevacuumcleaner．Whenthedishesareclean,thedishwasherturnsitselfoff． Notsothetelevision,whichisonfromthesuninthemorningtothemoonatnightandbeyond! Parentsmustexercisesomecontrolandshowsomeconcernabouttheculturalinfluenceonthechildwhenaprogramnotintendedforthatchildisviewed．Parentsneedtointervene．Noninterventionmaybeawisepolicyininternationalaffairs,buttheresultsofparentalnoninterventionwillnotbewiseatalL． Fromthefirsttwoparagraphsonemayinferthatthewriter'sattitudetowards "theolddays"is______
A.preferring B.hating C.being tired of D.disappointing正确答案B
