单选题
Compared with their parties, politicians are ______: they are considerably less enduring than the organizations in which they function.
【正确答案】
D
【答案解析】解析：句意：政治家与其政党相比起来更为善变：他们的韧性不如其所效力的组织。fickle“易变的，无常的”，与题干中less enduring“不持久的”语境相符，故为答案。obiquitous“无处不在的”，autonomous“自治的”，transitory“(持续时间)短暂的”，均需排除。