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  3. •Read the article below about a product. •In most of the lines 41-52 there is one extra word. It is either grammatically incorre

•Read the article below about a product. •In most of the lines 41-52 there is one extra word. It is either grammatically incorre

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问题 •Read the article below about a product.
•In most of the lines 41-52 there is one extra word. It is either grammatically incorrect or does not fit in with the meaning of the text. Some lines, however, are correct.
•If a line is correct, write CORRECT on your Answer Sheet.
•If there is an extra word in the line, write the extra word in CAPITAL LETTERS on your Answer Sheet.
                                             Voice Over IP
       VoIP or Voice over IP has been steadily evolving over about a decade. VoIP is generally considered as a subset of IP telephony -- a collection of technologies
41  that, being broadly described, encompass the convergence of voice, video, and
42  data on a public or private IP network. VoIP technology has been adopted by
43  practically all the major telecom carriers and service providers, including AT&T,
44  Level 3, and Sprint, who will have been offering VoIP as an option with their
45  respective virtual private network (VPN) services for several years, with
46  providing quality of service guarantees for VoIP calls. The basic VoIP’s primary
47  benefit is that it saves up money. By using VoIP equipment on site , businesses
48  get to bypass the traditional phone network to dramatically cut down phone costs
49  between branch offices and the other locations. Savings of 70% to 90% for
50  international calls are not uncommon, while many companies can not enjoy a
51  20% to 30% reduction in costs for domestic long distance. The basic VoIP which
52  indicates a transformation from a circuit-switched communications infrastructure to one based on IP data packets in our communications technology industry.
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