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0.What does the undertined word"demerits"in paragraphmean?A.Effects.B.Depths.C.Features.D.Drawbacks31.What might be talked about in the following paragraph?入.Ad小antages of digital reading,B.Benefits of higher-level readingways ditareading D.Meaures to practice deepreadng1》Tortoise and turtle shells can be used to stdy nuclear pollution scientists have found.Juststree rings can provide sapshots(筒菱说明)of the Earth's climate,and ice corescgive us information on past temperature.rescarchers found that the layers of shells can be usedas a time stamp of periods with nuclear fallout.The researchers focused on turtles and tortoises from areas that have seen nuclearpollution,and measured the uranium()that was present in the bony outer shell that isusually made of keratin().Each layer of shell equals to one year of the tortoise's life.and so can reveal what happened in its surrounding environment.Five different turtles and tortoises from natural history collections were studied.One ofthese came from Enewetak Atoll,and was collected in 1978.Enewetak Atoll and itsneighbour.Bikini Atoll.in the Pacific,were the sites of 67 nuclear tests,with Enewetak thesite of43 of these.Though the sea turtle was probably not alive during the time of the testing.researchers still found uranium pollution in the turtle 20 years after testing ended.Researchers also looked at an castern box turtle from Oak Ridge,Tennessee,in the US.Oak Ridge is the site of a nuclear facility that has produced and processed uranium since 1943.The turtle that was studied from there was collected in 1962 and may have bioaccumulatedradionuclides,or radioactive materials,from uranium waste products in the area.The research supports the idea that these animals can bioaccumulate human-maderadionuclides,or from the environment.It also supports the idea that these animals.whichoften live a long time,can record information about human activity with nuclear landscapesover a long period.We anticipate that combining analyses of historically collected and modernsamples will significantly expand our environmental monitoring abilities as they relate toongoing nuclear pollution questions.32.What made the test of uranium by the researehers possible?A.Uranium made its mark on the turtle shells.B.Uranium existed in large amounts in nature.C.The turtle shells were independent from the surrounding environmentD.The turtle shells'outer layers were composed of mysterious material33.Which of the following is TRUE according to paragraphsA.The turtle studied had to be alive during testing.B.Bikini Atoll and Oak Ridge stood next to each other.C Enewetak Atoll had more nuclear tests than Bikini Atoll.D.The eastern box turtle from Oak Ridge was collected in 1943.英语试题第？页（共12页）