根据以下材料回答1～20题：
Directions：
Readthefollowingtext.ChoosethebestwordforeachnumberedblankandmarkA,B,CorDonANSWERSHEET1.（10points）
Theideathatsomegroupsofpeoplemaybemoreintelligentthanothersisoneofthosehypothesesthatd arenotspeakitsname.ButGregoryCochranis___(1)___tosayitanyway.Heisthat___(2)___bird,ascientistwhoworksindependently___(3)___anyinstitution.Hehelpedpopularizetheideathatsomediseasesnot___(4)___thoughttohaveabacterialcausewereactuallyinfections,whicharousedMuchcontr oversywhenitwasfirstsuggested.
___(5)___he,however,mighttr embleatthe___(6)___ofwhatheisabouttodo.Togetherwithanothertwoscientists,heispublishingapaperwhichnotonly___(7)___thatonegroupofhumanityismoreintelligentthantheothers,butexplainstheprocessthathasbroughtthisabout.Thegroupin___(8)___areaparticularpeopleoriginatedfromcentr alEurope.Theprocessisnaturalselection.
ThisgroupgenerallydowellinIQtest,___(9)___12-15pointsabovethe___(10)___valueof100,andhavecontr ibuted___(11)___totheintellectualandculturallifeoftheWest,asthe___(12)___oftheirelites,includingseveralworld-renownedscientists,___(13)___.Theyalsosuffermoreoftenthanmostpeoplefromanumberofnastygeneticdiseases,suchasbreastcancer.Thesefacts,___(14)___,havepreviouslybeenthoughtunrelated.Theformerhasbeen___(15)___tosocialeffects,suchasastr ongtr aditionof___(16)___education.Thelatterwasseenasa（an）___(17)___ofgeneticisolation.Dr.Cochransuggeststhattheintelligenceanddiseasesareintimately___(18)___.Hisargumentisthattheunusualhistoryofthesepeoplehas___(19)___themtouniqueevolutionarypressuresthathaveresultedinthis___(20)___stateofaffairs.
第1题请选择(1)处最佳答案（）。
A．selected
B．prepared
C．obliged
D．pleased
正确答案：B答案：B
解析：本题测试语义逻辑衔接。“selected”意为“挑选”;“prepared”意为“准备”;“obliged”意为“迫使，责成”;“pleased”意为“高兴地，满足地”，前一句“人们不敢说”，本句中由“but”一词可推出意思与上句相反，即“Cochran准备说”，所以选B．
