III.ReadingCmprehension(30points,2pointsforeachitem)从下列每篇短文的问题后所给的四个选择项中选择出一个最佳答案,并在答案卡上将相应的字母涂黑。21.Accordingtothepassage,mostparentstendtoA.permitchildrentodowhattheywantThereissomevariationamongstatesinhowelectorsareappointed,yetgenerallytheyarechosenbythepopularvote.Eachpoliticalpartyinastatechoosesalistoflocalworthiestobemembersoftheelectoralcollegeiftheparty’spresidentialcandidatewinsA.positiveB.negativeC.subjectiveD.objective