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1、Recent eseach has claim hat nexssf poiiveins in the air can have an llefft n peplesphysicopychlogal helth. Wat ar posiive ions?Well,h air full of ios，electricalycaredparticles，ad geneally er sa roug balance bewen te pitive and the negativ hare.utsmeties this baancebecme diturbed and a lg portionf po
2、itive ion ae fund.This happensnalefore thundrstorm,eahquaks when wids casth istal，Hasin orSarav ae bowing in ertanuntre. Or t ca be cusd bya ud-uof stati electriciy idoors fomcrpesr lothing mado ma-made fbres,or from TV sts，uplicators r computr isplay scrensena lrge nubero poiive ioe prsn in the aia
3、y pope ernce unpleasan ffectssh aheadaches,fague,irrtabiity，and soe partcurysenstiv peop suffernauseao enmental distubanc. Anias arealsaffected,paticlarl bfore rtquakes，snkes have ben bserved to coeut of inaion,ras flefro their burws，dogsold catsjmp about unccountably. Thi hs dte USGeograpialSurvey
4、tofnda eto of volunteer to wath animalsin n effortt foesee such disatersbefoey hi vulnable ras c asCaifrni. Cnvrely,when lr nurs fnegatieis are presen，then popl av a eelingof wellbeng. arl ondiio tha prouce these rge aontsare nr the a，cose to waterfals orfounais， n any pl whee ater i sprayed， forms
5、a spra. Thi probay aout f the benficial eect ofa oay b sea, o inhe unainswih tubln treas or waterfals.xadacoTo incase the uply of negativeions indoors,se entistsreommn thes of ioniss:small prabe machnes,whch generte negaiveions.hey claim that isrs onlcla and refrhthe air ut aloimprove th health o op
6、lesensitvetoexcess postiveonOf course,thre are e ractos,ther scietist,ho dismissuch claimnd areskepticl abounegiv/positive iorsh. Thereoe popl c ol mae up hir on mnd by osevg he efects nthmselve,o ths,ofa negaive rich r p envionmen.After i is detale wether epening on seismi reaings o ncpae earthqkes
7、moe feive tan wahig the cat.引用 .Wa fet oe exceei ositive inization he n smeople?.Thetink ty reinane B.The feel ratherbadtemed an shrt-ussedCThey ece iole sic D.The are to i o donying.2In ccoan ith th passg,tticelectriy can caed b_. Aug ho-ma electrigoods.B.earing clothes madef nua matrials.C.waling
8、on aricia floor ovings. Dcopying V pogram on a omput .A hi negatve ioncouti ikelyto b oun_ Anea a nd ith a water pump. B.close ta slow-floigriver .hgh in smebaren mtai D.y rottig wer sprinker. 4.Wkind f achine ca gnete ngi isndoos？ .I B.Air-cnditners. .Exu-fas .aum pums.5.ome cieists belie that_ A.a
9、tcinnima to anticipate arthquaksis me effectitndepenno seisrphy.the unusual behavirfaials cannot be ruse. C.neitherwacing or uin eismographsisrbleD.erthqak 【答案】C We llknow that the nal nay ccle of ctivty is fsome 7-8 horssle alternation wit some1617 hourwkeulness adthat, broadly speakig，the see rmal
10、lcoincids witht hous ofdknes Our rsent nces wihho easiy an to wt tentthis cycle cn moifed. Te uestion is no mracdemic on.The ease,fo example, wth whihpeole can chnge from orkingn theayto wrkin ti is aqstin o gowng imortace iutwhere atomaion allsfor ronth-clok woking ofmachne. It normally akes from f
11、ive da to one eek or a eron to adat oarevered routine of e ad wakeulnes, sein duringthday an woring a ight fortunaty, it s ofnt cas i industrat shifts re hangedey week; peron y wo frm 12:00 midnight to 8:00.m.onewe, 8：00am. o 4:00 p.he net,nd 4:00p.m to12:0 midng he thid and so o. Ts mean thatn sone
12、r has h gtsed to oneroue thhe haso cange o aote， s thatmuch of hisme is spent eitherworin reepngvey eficient.Te only real outin appears o e to hanovthe nihtshif t a numer fpemanent ngtwoer.An iterestin sudy of the omesti lfend eth of nght-st worerss cae t y on n 197 She ond ahih inen of dsturbed slep ad otediorder amog oe n alernatingdy nd nigtshift， but no aborma occrrnce
