It could be concluded from the passage that the ooma service A.worked illegally by losing termination fees. B.improved the efficiency of the phone system. C.was paid by the ooma customers. D.covered the ooma traffic by broadband connection.
A.worked B. B.improved C. C.was D. D.covered E.
【参考答案】
B 推理判断题。文章第四段倒数第二句提到ooma利用了闲置的电话线路,提高了电话系统的使用效率,故选B。