题目内容
An emotion that is less well understood is jealousy. Why do people become jealous in intimate sexual relationships？ One series of studies tested evolutionary hypotheses about differences in the concerns men and women have about their partners' fidelity. Since females can have only a limited number of children during their lifetimes, to maximize their reproductive success they should be motivated to form. relationships with males who have resources and will contribute them to their offspring. Indeed, cross-cultural evidence demonstrates that one of the main mate selection criteria used by females around the world is male resources. From a female's point of view, then, infidelity accompanied by, emotional commitment to the other woman is a major threat to resources. A man unlikely to divert resources from his mate and her offspring to a casualling, but the risk increases dramatically if he becomes emotionally involved and perhaps considers switching long-term partners. Hence, a woman's jealousy would be expected to focus on her mate's emotional commitment to another female.
For males, the situation is different. If a male commits himself to an exclusive relationship with a female, he must be certain that the offspring in whom he is investing are his own. Since he cannot be sure of paternity, the best he can do is to prevent his mate from copulating with any other males. In males, then, jealousy would be expected to focus less on the female's emotional commitment or resources and more on her tendency to give other males sexual access. Indeed, in species 'ranging from insects to humans, males take extreme measures to prevent other males from inseminating their mates. In humans, male sexual jealousy is the leading cause of homicides and of spouse battering cross-culturally.
This passage discusses the______approach to human emotions.
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You'd think that a software company would make most of its money from, well, selling software. But you'd be wrong. For one thing, companies don't sell software, strictly speaking; they license it. The profit margin on a software license is nearly 100 percent, which is why Microsoft gushes billions of dollars every quarter.
But what's the value of a license to a customer？ A license doesn't deliver the code, provide the utilities to get a piece of software running, or answer the phone when something inevitably goes wrong. The value of software, in short, doesn't lie in the software alone. The value is in making sure the soft-ware does its job. Just as a traveler should look at the overall price of a vacation package instead of obsessing over the price of the plane ticket or hotel mom, a smart tech buyer won't focus on how much the license costs and ignore the support contract or the maintenance agreement.
Open-source is not that different. If you want the software to work, you have to pay to ensure it will work. The open-source companies have refined the software model by selling subscriptions. They roll together support and maintenance and charge an annual fee, which is a healthy model, though not quite as wonderful as Microsoft's money-raking one. Tellingly, even Microsoft is casting an envious eye at aspects of the open-source business model. The company has been taking halting steps toward a similar subscription scheme for its software sales. Microsoft's subscription program, known as Soft-ware Assurance, provides maintenance and support together with a software license. It lets you up-grade to Microsoft's next version of the software for a predictable sum. But it also contains an implicit threat: If you don't switch to Software Assurance now, who knows how much Microsoft will charge you when you decide to upgrade？
Chief information officers hate this kind of "assurance", since they're often perfectly happy running older versions of software that are proven and stable. Microsoft, on the other hand, rakes in the software-licensing fees only when customers upgrade. Software Assurance is Microsoft's attempt to get those same licensing fees but wrap them together with the service and support needed to keep systems running. That's why Microsoft finds the open-source model so threatening: open-source companies have no vested interest in getting more licensing fees and don't have to pad their service contracts with that extra cost. In the end, the main difference between open-source and proprietary software companies may be the size of the check you have to write.
The author used the example of a traveler (Para. 3) to show that
A．neitherB．noneC．eitherD．both
接受估价委托后，受托估价机构不得转让、变相转让受托的估价业务，并应明确至少一名合适的估价人员负责该估价项目。 ()
According to the passage the low-Earth orbit is______.
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