【正文】 erms. Take the polar dinosaur argument. When dinosaurs lived, even the polar regions, where dinosaur fossils have been found, were much warmer than today, warm enough during part of the year for animals that were not endotherms to live. And during the months when the polar regions were cold, the socalled polar dinosaurs could have migrated to warmer areas or hibernated like many modern reptiles do. So the presence of dinosaur fossils in polar regions doesn39。t necessarily mean dinosaurs were highenergy endotherms built for running. There is another explanation for having legs under the body. This body structure supports more weight, so with the legs under their bodies, dinosaurs can grow to a very large size. Being large had advantages for dinosaurs, so we don39。s true. The dinosaur bones also have growth rings. Growth rings are thickening of the bone that indicates periods of time when the dinosaurs weren39。ll explain. If hundreds of people were living in the great houses, then there would have to be many fireplaces, where each family did its daily cooking, but there are very few fireplaces. In one of the largest great houses, there were fireplaces for only around ten families. Yet there were enough rooms in the great house for more than a hundred families, so the primary function of the houses couldn39。 。t there more spilled maize on the floor? Why aren39。t well supported either. You know that mound at Pueblo Alto? It contains lots of other materials besides broken pots, stuff you wouldn39。s a small price to pay for what it does offer. The criticisms in the reading are largely the result of prejudice against and ignorance about how far online encyclopedias have e. First, errors. It39。s easy for errors in factual material to be corrected in an online encyclopedia But with the printed and bound encyclopedia, the errors remain for decades. Second, hacking. Online encyclopedias have recognized the importance of protecting their articles from malicious hackers. One strategy they started using is to put the crucial facts in the articles that nobody disputes in a readonly format, which is a format that no one can make changes to. That way you are making sure that the crucial facts in the articles are reliable. Another strategy that39。s worth knowing about? The problem for traditional encyclopedias is that they have limited space, so they have to decide what39。s not. And in practice, the judgments of the group of academics that make these decfsions don39。 interests. The diversity of use in topics that online encyclopedias offer is one of their strongest advantages TPO7 Reading In an effort to encourage ecologically sustainable forestry practices, an international anization started issuing certifications to wood panies that meet high ecological standards by conserving resources and recycling materials. Companies that receive this certification can attract customers by advertising their products as ecocertified. Around the world, many wood panies have adopted new, ecologically friendly practices in order to receive ecocertification. However, it is unlikely that wood panies in the United States will do the same, for several reasons. First, American consumers are exposed to so much advertising that they would not value or even pay attention to the ecocertification label. Because so many mediocre products are labeled 39。39。t treat all advertising the distinguish between advertising claims that panies make about their own products and claims made by independent certification have a lot of confidence in independent agencies. Thus ecologicalminded Americans are likely to react very favorably to wood products ecologically certified by independent anization with a intenational reputation for trustworthiness. Second point ,of course it is true that American consumers care a lot about price ,who doesn39。 decisions only when the price of one peting products is much higher or lower than the the difference between two products is small ,say , less than 5 percent,as is the case with certified wood, American often do choose on factories other than Americans are being increasingly convinced of the value of preserving and protecting the environment. And third, US Wood panies should definitely pay attention what is going on in the wood business because of foreign consumers but because of foreign petitors. As I just told you,there is a good chance that many American consumers will be interested in ecocertified products, and guess why? If American panies are slow capturing those consumers,you can be sure that foreign panies will soon start crowding into the American markets ,offering ecocerfied wood that domestic panies don39。s account of the Chevalier39。s memoir is pretty accurate overall, and is, by and large, a reliable historical source Let39。t mean that the Chevalier was poor. Let me explain. We know that in Switzerland, the Chevalier spent huge amounts of money on parties and gambling, and he had wealth. But it was a kind of property you have to seil first to get money. So it usually took a few days to convert his assets into actual money. So when he ran out of cash, he had to borrow some while he was waiting for his money to arrive, but that39。s conversation. Evidently the Chevalier kept his notes of these conversations for many years and referred to them when writing the memoir. Witnesses who lived with the Chevalier in his later life confirmed that he regularly consulted notes and journals when posing the memoir. Third, the Chevalier39。s main source of power, the internalbustion engine. By far the most promising alternative source of energy for cars is the hydrogenbased fuelcell engine, which uses hydrogen to create electricity that, in turn, powers the car. Fuelcell engines have several advantages over internalbustion engines and will probabl