参考答案:what controls the flow of carbon dioxide 答案解析:[考点] ①主语从句;②“二氧化碳流通”the flow of carbon dioxide。 [点拨] 本句是“it作形式主语”;真正的主语是what引导的从句,其中what又充当了句子的主语
第14题:[单选题]The _____ is a general description of the architecture of a workflow management system used by the WFM
C,in which the main components and the associated interfaces are summarized. A.waterfall model B.workflow reference model C.evolutionary model D.spiral model 参考答案:B