【正文】 s legs are positioned underneath its body, not at the body39。s face is very much like that of portraits known to be by Rembrandt. But there are problems with the painting that suggest it could not be a work by Rembrandt.First, there is something inconsistent about the way woman in the portrait is dressed. She is wearing a white linen cap of a kind that only servants would wearyet the coat she is wearing has a luxurious fur collar that no servant could afford. Rembrandt, who was known for his attention to the details of his subjects39。Integrated writing 1—fourday workweekReadingIn the United States, employees typically work five days a week for eight hours each day. However, many employees want to work a fourday week and are willing to accept less pay in order to do so. A mandatory policy requiring panies to offer their employees the option of working a fourday workweek for fourfifths (80 percent) of their normal pay would benefit the economy as a whole as well as the individual panies and the employees who decided to take the option.The shortened workweek would increase pany profits because employees would feel more rested and alert, and as a result, they would make fewer costly errors in their work. Hiring more staff to ensure that the same amount of work would be acplished would not result in additional payroll costs because fourday employees would only be paid 80 percent of the normal rate. In the end, panies would have fewer overworked and errorprone employees for the same money, which would increase pany benefits. For the country as a whole, one of the primary benefits of offering this option to employees is that it would reduce unemployment rate. If many fulltime employees started working fewer hours, some of their workload would have to be shifted to others. Thus, for every four employees who went on an 80 percent week, a new employee could be hired at the 80 percent rate. Finally, the option of a fourday workweek would be better for individual employees. Employees who could afford a lower salary in exchange for more free time could improve the quality of their lives by spending the extra time with their families, pursuing private interests or enjoying leisure activities. ListeningOffering employees the option of a fourday workweek won’t affect the pany profits, economic conditions or the lives of employees in the ways the reading suggests.First, offering a fourday workweek will probably force panies to spend more, possibly a lot more. Adding new workers means putting much more money into providing training and medical benefits. Remember the costs of things like health benefits can be the same whether an employee works four days or five. And having more employees also requires more office space and more puters. These additional costs would quickly cut into pany profits.Second, with respect to overall employment, it doesn’t follow that once some employees choose a fourday workweek。 clothing, would not have been guilty of such an inconsistency.Second, Rembrandt was a master of painting light and shadow, but in this painting these elements do not fit together. The face appears to be illuminated by light reflected onto it from below. But below the face is the dark fur collar, which would absorb light rather than reflect it. So the face should appear partially in shadowwhich is not how it appears. Rembrandt would never have made such an error.Finally, examination of the back of the painting reveals that it was painted on a panel made of several pieces of wood glued together. Although Rembrandt often painted on wood panels, no painting known to be by Rembrandt uses a panel glued together in this way from several pieces of wood.For these reasons the painting was removed from the official catalog of Rembrandt39。s side, as they are for crocodiles and many lizards. The legs of all modern endotherms are underneath the body, and so were the legs of dinosaurs. This strongly suggests that dinosaurs were endotherms.Haversian canalsThere is also a connection between endothermy and bone structure. The bones of endotherms usually include structures called Haversian canals. These canals house nerves and blood vessels that allow the living animal to grow quickly, and rapid body growth is in fact a characteristic of endothermy. The presence of Haversian canal in bone is a strong indicator that the animal is an endotherm, and fossilized bones of dinosaurs are usually dense with Haversian canals.ListeningMany scientists have problems with the arguments you read in the passage. They don’t think those arguments prove that dinosaurs were endotherms. 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 doesn’t prove the dinosaurs were endotherms. Well, what about the fact that dinosaurs have their legs placed under their bodies, not out to the side like crocodiles. That doesn’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 don’t need the idea of endothermy and running to explain why dinosaurs evolved to have their legs under their bodies. Ok, so how about bone structure? Many dinosaur bones do have Haversian canals, that’s true. The dinosaur bones also have growth rings. Growth rings are thickening of the bone that indicates periods of time when the dinosaurs weren’t rapidly growing. T