It seems to the author that the implementation of the new regulation would be______. A．successful and rapid B．necessary and smooth C．effective but gradual D．important but difficult
A. A．successful B.necessary C.effective D.important
【参考答案】
D 推断题。作者在第三段和第四段中列举了监管者和航空公司双方的理据之后，在最后一段中集中讨论新法规通过的前景。应......