必须的兵役服务。A 意为“取消”，B 意为“推迟”，C 意为“拒绝”，D 意为“表现”。根据题意，故正确选项为B。5. Of interest is also the question whether, and if so, how a technology marked by many as"revolutionary" can impact on established learning and teaching in a context which appears to be) to change.