参考答案：B

解析： 形近识别。 affect影响：Smoking affects health．吸烟影响健康。affiliate加盟，并入：Our club is affiliated with a national organization of similar clubs．我们的俱乐部加入了一个由同类俱乐部组成的全国性组织。affirm肯定，确认：The minister affirmed the government's intention to reduce taxes．部长确认政府有减税意向。effect引起，产生：We have tried our best to effect the reconciliation between the two parties．我们已尽了最大努力希望促成双方和解。