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  3. The staggering variety of free stuff available on the Internet sometimes seems to have repealed the first law of economics: Ther

The staggering variety of free stuff available on the Internet sometimes seems to have repealed the first law of economics: Ther

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问题     The staggering variety of free stuff available on the Internet sometimes seems to have repealed the first law of economics: There’s no such thing as a free lunch. But as so often happens, the dismal science actually has it right. When it looks like you’re getting something for nothing, somebody is paying, and it’s often instructive to know who that is.
    I’ve been testing a new phone service called ooma that provides an interesting case in point. Once you pay $399 up front for a box called the ooma Hub and connect it to your phone and the Internet via your home network, you are promised free, unlimited phone calls over two lines, plus voice mail. The system works fine and is simple to set up.
    When a voice-over-Internet call has to go to a regular phone number, a service such as ooma usually has to pay a "termination fee" to a carrier such as Verizon. Skype, for example, charges 2% per minute for calls outside the Skype network. But ooma avoids this by using some of its customers— those who have kept regular phone lines—to serve as gateways onto the local phone network at no charge.
    When you want to call outside the ooma network, the call moves from your Hub over the Internet to a second landline-connected Hub within the destination’s local calling area. The Hub dials the target number and patches the call through. In effect, ooma customers with landlines pay to keep the whole system going. You don’t even notice if your landline is being used because your own phone calls go out over your broadband connection, with your flat-rate monthly phone bill covering the ooma traffic. In fact, this improves the efficiency of the phone system by putting idle lines to work. But if ooma ever gains real traction, I expect a legal assault from big phone companies, which are losing income from termination fees.
    Web services do take advantage of genuine economies. The phone network is more expensive than the Net. Lots of Net players build on these advantages. Skype relies on selected users who act, often without their knowledge, as "super nodes" to manage the system. FreeConference.com provides calls by taking advantage of regulatory quirks—namely, the stiff tennination fees long-distance carriers must pay to certain rural phone companies that handle calls into their territory. In effect, the free conferences are subsidized by customers and shareholders of the long-distance carriers. You may as well enjoy free calls while you can. But it’s always a good idea to read the fine print. If it isn’t obvious who’s paying for a free service, it might well be you.
One cannot notice if the landline is being used by others because
选项 A、the ooma traffic cannot be calculated by the outside network.
B、your monthly phone bill still remains stable with new traffic.
C、your Hub will dial the target number from a second Hub.
D、the whole system keeps going with the broadband connection.
答案B
解析 推理判断题。第四段第四句指出人们不会注意到电话费的变化，因为每月的电话费几乎都是固定的，故选B。ooma网络流量包括在每月的电话账单中，不是不可被计算的，故A错误；C项是ooma软件运作的原理，D项说明ooma软件需要通过宽带连接进行运作，都不是人们注意不到其常规电话线是否被人使用的原因，故都可排除。
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