9月9日 综合 TPO4
The passage shows several considerable evidences to provethat dinosaur were endotherms. However, the lecture refutes all evidences thepassage provides and believes that dinosaur could not necessarily beendotherms, and reasons are listed below. To begin with, because the polar region in which thedinosaurs fossils were discovered could be much warmer million years ago thannow, so dinosaurs did not necessarily have the ability to maintain atemperature well above that of the surrounding environment. Therefore, theevidence raised by passage about discovery place of dinosaur fossils does notstand on this point. In addition, the passage believes that the only reason forthe legs underneath body is to support fast running which is the important characteristicof endotherms. However, several possible purposes could explain why the positionof the legs was underneath the body. For example, it could be used to supportthe great weight of dinosaur rather than fast running. Furthermore, besides the Halverson canals, the fossilizedbones of dinosaurs also come up with Growh Ring which could limit the growth ofdinosaurs during cold climate, while endothermy animals could keep constantgrowth rate during cold climate. Therefore, dinosaurs could not necessarily bea type of endotherm.
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