（Ⅰ）求θ的距估计量；

A.apracticeofanadaandurope

B.apolicyadoptedbytheUSgovernment

C.intendedfortheretiringbaby-boomers

D.administeredbyprivateenterprises

A.makeslearningagloballanguageunnecessary

B.facilitatesthelearningandusingofthoselanguages

C.raisespublicawarenessofsavingthoselanguages

D.makesiteasierforlinguiststostudythoselanguages

A.remarkablywell-keptinthismodemworld

B.exceptionallypowerfultoolsofcommunication

C.quitepossibletoberevivedinsteadofdyingout

D.auniquewayofbringingdifferentgroupstogether

A.hasthebiggesthealthproblemofthecarindustry

B.hasmadeprofitsfromitshealth-carelegacy

C.hasaccumulatedtooheavyahealth-careburden

D.owesagreatdealofdebttoitsemployees

A.merica’shealthsystemhasitsstrengthsandweaknesses

B.theUSgovernmentpaysmedicalbillsforthepoorandtheelderly

C.some46millionmericansdonothavemedicalinsurance

D.uropeansbenefitalotfrommerica’smedicalresearch