Haveyouheardofthe"Doomsday（世界末日）clock"？Whilethenamesoundsparticularenoughtodrawourattention，thereisnowaytoactuallypredictdoomsday．Theclockisavisualwayofrepresentingthedangersourworldfacesan
Haveyouheardofthe"Doomsday（世界末日）clock"？
Whilethenamesoundsparticularenoughtodrawourattention，thereisnowaytoactuallypredictdoomsday．Theclockisavisualwayofrepresentingthedangersourworldfacesandtheurgencytoact-withmidnightsymbolizingdoomsday．
TheBulletinofAtomicScientists，theorganizationthatmaintains（维护）theclock，decidedtokeeptheclockat3minutestomidni-thesameaslastyear．DespitetheIrannucleardealthatweakenedthethreat（威胁）ofnuclearwar，theorganizationcontinuestoworryaboutthelackofprogressonotherglobalissuesofconcern．
Theclockwascreatednearly70yearsagobyagroupofscientistswhohadworkedontheManhattanproject-thatcreatedtheworld'sfirstatomicbomb．ThebombsweredroppedontwoJapanesecities．Though it broughtanendtooneoftheworstwarsinhumanhistory，thebombsalsoexposedtheworldtothedangersofnucleartechnology．
OneofthenuclearphysicistsontheManhattanprojectwasmarriedtoanartistnamedMartylKangsdorf．ItwasMartyl'sideatocreateaclockandsetthehandtosevenminutestomidnightwhenitfirstcreated．
Sincethen，theclockhasbeenapowerfulwaytoshowhumanityhowclosetheworldistocatastropheduetohumanaction．Tomaintainthisclock，everyyeartwentymembersoftheBulletinofAtomicScientistsgathertogetherandassessthebiggestthreatstohumanity．Whenscientistslookedbackattheeventsof2015．twosignificantthreatscontinuedtoexist-climatechangeandinvestmentinnuclearweaponsbyvariousnationsaroundtheworld．
Accordingtothescientists，wemaybeabletoavoiddisasterifhumanityreducesspendingonnuclearweapons，sharplyreducesgreenhousegases，dealswithcommercialnuclearwaste，andmakesagreementstopreventthemisuseofnewtechnologies．
32．TheDoomsdayclockwascreatedfor___．
A．remindingpeopleofthepainfulpast
B．correctingtimetothesamestandard
C．predictingthedoomsdayoftheworld
D．warninghumanityoftheurgentthreats
33．Whatdoestheunderlinedword"it"inParagraph4referto？___
A．Thedoomsdayclock． B．Thefirstatomicbomb．
C．Droppingthea
