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