根据下列文章,回答26~30题。 It is a wise father that knows his own child, but today a man

根据下列文章，回答26～30题。

Itisawisefatherthatknowshisownchild,buttodayamancanboosthispaternal(fatherly)wisdom—oratleastconfirmthathe’sthekid’sdad.Allheneedstodoisshellout$30forapaternitytestingkit(PTK)athislocaldrugstore—andanother$120togettheresults.

Morethan60,000peoplehavepurchasedthePTKssincetheyfirstbecameavailablewithoutprescriptionslastyears,accordingtoDougFogg,chiefoperatingofficerofIdentigene,whichmakestheoverthecounterkits.MorethantwodozencompaniessellDNAtestsdirectlytothepublic,ranginginpricefromafewhundreddollarstomorethan$2500.

Amongthemostpopular:paternityandkinshiptesting,whichadoptedchildrencanusetofindtheirbiologicalrelativesandfamiliescanusetotr ackdownkidsputupforadoption.DNAtestingisalsothelatestr ageamongpassionategenealogists—andsupportsbusinessesthatoffertosearchforafamily’sgeographicroots.

Mosttestsrequirecollectingcellsbyswabbingsalivainthemouthandsendingittothecompanyfortesting.AlltestsrequireapotentialcandidatewithwhomtocompareDNA．

Butsomeobserversareskeptical,“Thereisakindoffalseprecisionbeinghawkedbypeopleclaimingtheyaredoingancestr ytesting,”saysTreyDuster,aNewYorkUniversitysociologist.Henotesthateachindividualhasmanyancestors—numberinginthehundredsjustafewcenturiesback.Yetmostancestr ytestingonlyconsidersasinglelineage,eithertheYchromosomeinheritedthroughmeninafather’slineormitochondrialDNA,whichispasseddownonlyfrommothers.ThisDNAcanrevealgeneticinformationaboutonlyoneortwoancestors,eventhough,forexample,justthreegenerationsbackpeoplealsohavesixothergreatgrandparentsor,fourgenerationsback,14othergreatgreatgrandparents.

Criticsalsoarguethatcommercialgenetictestingisonlyasgoodasthereferencecollectionstowhichasampleiscompared.Databasesusedbysomecompaniesdon’tr elyondatacollectedsystematicallybutr atherlumptogetherinformationfromdifferentr esearchprojects.ThismeansthataDNAdatabasemayhavealotofdatafromsomeregionsandnotothers,soaperson’stestr esultsmaydifferdependingonthecompanythatprocessestheresults.Inaddition,thecomputerprogramsacompanyusestoestimaterelationshipsmaybepatentedandnotsubjecttopeerrevieworoutsideevaluation.

第26题Inparagraphs1and2,thetextshowsPTK’s

A．easyavailability.

B．flexibilityinpricing.

C．successfulpromotion.

D．popularitywithhouseholds.