【AfewyearsafterWorldWarIIfinished,scientistsspokewithgreateagernessabouttheuseofnuclearpower(核能源)assourceofenergy.Withintwentyyears,theysaid,nuclearwouldtaketheplaceofcoal,gasandoilasasourceofpower】

　　AfewyearsafterWorldWarIIfinished,scientistsspokewithgreateagernessabouttheuseofnuclearpower(核能源)assourceofenergy.Withintwentyyears,theysaid,nuclearwouldtaketheplaceofcoal,gasandoilasasourceofpowerathomesandinindustry.Thispromisehasneverbeencarriedout(兑现)andtherearenowseriousdoubtsthatiteverwillbe.Nuclearpowerplantsareusedtoproduceenergyinsomewealthiercountries,butthecostishigh.

　　Althoughsafetymeasureshavebeentaken,radiationleaks(辐射泄漏)havetakenplaceandworkershavebeenkilledoraffected.Theproblemofgettingridofthenuclearwastehasprovedmostdifficult.Thereisalimittotheamountofwastematerialswhichcanbeburiedinthegroundorpouredonthesea-bed.Thesemethodsmayalsocausemoreproblems.Wastematerialspollutedbyradiationmayremaindangerousfor200yearsormore.

　　Itisnosurprisethatscientistshavenowturnedtothesunandtheseaassourcesofpower.Thesunshinesdayafterdayalmostwastefully,providinguswithenergyfarbeyondallourneeds.

　　AftertheWorldWarII,scientistshopedtouse________.A

　　nuclearpowerassourceofenergy

　　B

　　oilassourceofenergy

　　C

　　gasassourceofenergy

　　D

　　seawaterassourceofenergy

　　Themostdifficultproblemis________.A

　　makingthenuclearwaste

　　B

　　throwingawaythenuclearwaste

　　C

　　buryingthenuclearwasteintheground

　　D

　　pouringthenuclearwasteonthesea

　　Theunderlinedword“plants”inthefirstparagraphmeans________.A

　　trees

　　B

　　grows

　　C

　　factories

　　D

　　laboratories

　　Itis________tousenuclearpowerplantstoproduceenergy.A

　　expensive

　　B

　　difficult

　　C

　　cheap

　　D

　　easy

　　Whichofthefollowingistrue?A

　　Itisimpossibletogetridofthenuclearwaste.

　　B

　　Allthenuclearwastecanbegotridof.

　　C

　　Mostofthenuclearwastecanbemadecleanbeforeitisthrownaway.

　　D

　　Notallthenuclearwastecanbegotridof.

　　Nuclearw