单项选择题

某建设项目采用插值法计算内部收益率，求得i1=15%、i2=18%、i3=20%时所对应的净现值分别为150万元、30万元和–10万元，则该项目的内部收益率为（）。

A.17.50%
B.18.38%
C.19.50%
D.21.50%

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The term 'disruptive technology' is popular, but is widely misuseD.It refers not simply to a clever new technology, hut to one that undermines an existing technology—and which therefore makes life very difficult for the many businesses which depend on the existing way of doing things. Twenty years ago, the personal computer was a classic examplE.It swept aside an older mainframe-based stylE.of computing, and eventually brought IBM, one of the world's mightiest firms at the time, to its knees. This week has been a coming-out party of sorts for another disruptive technology, 'voice over internet protocol' (VOIP), which promises to be even more disruptive, and of even greater benefit to consumers, than personal computers.VOIP's leading proponent is Skype, a small firm whose software allows people to make free calls to other Skype users over the internet, and very cheap calls to traditional telephones—all of which spells trouble for incumbent telecoms operators. On September 12th, eBay, the leading online auction house, announced that it was buying Skype for $2.6 billion, plus an additional $1.5 billion if Skype hits certain performance targets in coming years.This seems a vast sum to pay for a company that has only $60m in revenues and has yet to turn a profit. Yet eBay was not the only company interested in buying SkypE.Microsoft, Yahoo!, News Corporation and Google were all said to have also considered the ideA.Perhaps eBay, rather like some over-excited bidder in one of its own auctions, has paid too much. The company says it plans to use Skype's technology to make it easier for buyers and sellers to communicate, and to offer new 'click to call' advertisements, but many analysts are sceptical that eBay is the best owner of SkypE.Whatever the merits of the deal, however, the fuss over Skype in recent weeks has highlighted the significance of VOIP, and the enormous threat it poses to incumbent telecoms operators.For the rise of Skype and other VOIP services means nothing less than the death of the traditional telephone business, established over a century ago. Skype is merely the most visible manifestation of a dramatic shift in the telecoms industry, as voice Galling becomes just another data service delivered via high-speed internet connections. Skype, which has over 54m users, has received the most attention, but other firms routing calls partially or entirely over the internet have also signed up millions of customers.At the beginning of the text, the author ______.A.states the popularity of the termB.indicates a clever new technologyC.undermines an existing technologyD.corrects a misconception

A.B.6
C.5
D.
E.
F.
At
G.
A.states
H.indicates
I.undermines
J.corrects

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一般资料：求助者，女性，22岁，工人。案例介绍：求助者从小受当医生的妈妈影响怕脏，只要别人碰过的衣物就要洗或丢弃，只要手碰了认为不干净的东西就洗个不停，自己控制不住，非常痛苦。求助者刚来工厂不久，生活上有些不适应。老职工赵某在生活上帮助她，业务上指导她，因此关系比较密切。某次业务考试，求助者不及格，内心紧张，后听别人说赵某曾患有“传染性肝炎”，因此更加紧张，怕被传染上，于是将所有被赵某接触过的衣物器皿丢掉。如果自己碰到被赵某摸过的东西就不断地洗手，直到双手发白为止，否则就会内心紧张，甚至感到思维都不灵活了。自己也知道这样是没必要的，但无法控制。求助者担心并十分痛苦，所以前来咨询。心理咨询师观察了解到的情况：家属反映，求助者性格内向，做事拘谨，一丝不苟，对自己要求严格，追求完美。该求助者的情绪症状主要是( )。D.抑郁

A.焦虑
B.强迫
C.恐怖