单选题 I ______ are often paid because of long service, special merit, or injuries received.
【正确答案】 D
【答案解析】解析：pension n．养老金，抚恤金(retire on a pension；people on pension)。subsidy n.津贴，补助金。allowance n.(定期给予的)津贴，补贴：零用钱。bonus n．奖金，红利；额外给予的东西。