NN来看看一只阅读狗会不会是这篇GWD呢

rdfyj

2.1.1.M恐龙
V1 joe5436611

讲一种(楼主模糊记忆：maissuar)恐龙，拼写记不得了m开头，一页两段。第一段说这种恐龙跟鸟一样有个什么bone，有一句话出了题的。第二段给出了科学家的一个猜测：忘了。
这篇文章不难。
这是阅读狗里的

Two opposing scenarios, the “arboreal” hypothesis and the “cursorial” hypothesis, have traditionally been put forward concerning the origins of bird flight. The “arboreal” hypothesis holds that bird ancestors began to fly by climbing trees and gliding down from branches with the help of incipient feathers: the height of trees provides a good starting place for launching flight, especially through gliding. As feathers became larger over time, flapping flight evolved and birds finally became fully air-borne. This hypothesis makes intuitive sense, but certain aspects are troubling. Archaeopteryx (the earliest known bird) and its maniraptoran dinosaur cousins have no obviously arboreal adaptations, such as feet fully adapted for perching. Perhaps some of them could climb trees, but no convincing analysis has demonstrated how Archaeopteryx would have both climbed and flown with its forelimbs, and there were no plants taller than a few meters in the environments where Archaeopteryx fossils have been found. Even if the animals could climb trees, this ability is not synonymous with gliding ability. (Many small animals, and even some goats and kangaroos, are capable of climbing trees but are not gliders.) Besides, Archaeopteryx shows no obvious features of gliders, such as a broad membrane connecting forelimbs and hind limbs.

The “cursorial”(running) hypothesis holds that small dinosaurs ran along the ground and stretched out their arms for balance as they leaped into the air after insect prey or, perhaps, to avoid predators. Even rudimentary feathers on forelimbs could have expanded the arm’s surface area to enhance lift slightly. Larger feathers could have increased lift incrementally, until sustained flight was gradually achieved. Of course, a leap into the air does not provide the acceleration produced by dropping out of a tree; an animal would have to run quite fast to take off. Still, some small terrestrial animals can achieve high speeds. The cursorial hypothesis is strengthened by the fact that the immediate theropod dinosaur ancestors of birds were terrestrial, and they had the traits needed for high lift off speeds: they were small, agile, lightly built, long-legged, and good runners. And because they were bipedal, their arms were free to evolve flapping flight, which cannot be said for other reptiles of their time.

这是GWD27-Q 3 to Q6，也就是TN18的第一篇

rdfyj

都有科学家的猜测，和M恐龙与birds,而第一段中的什么bone很可能是air-borne

fcxir

up

ghovik

顶一下

立小夏

顶一下。。。。

rdfyj

都木有人解答个吗？还是不该这么问？明天就考了呀

harryhuang

好像应该不是这篇 这是最新的同学发的机经
阅读：有一个是说一种鸟恐龙，专家认为这个物种对幼儿时期特别呵护，因为脚骨没长全却从牙齿的化石里发现什么其他食物（意思就是这么小的幼儿不应该能吃到这种食物，是大人喂的）。第二段是反驳这个专家的结论，认为这个物种并没有对幼儿特别呵护，是从这个物种的另外一个分类的鸟恐龙的化石里找到的。

应该不是GWD的这篇了

rdfyj

好像应该不是这篇 这是最新的同学发的机经
阅读：有一个是说一种鸟恐龙，专家认为这个物种对幼儿时期特别呵护，因为脚骨没长全却从牙齿的化石里发现什么其他食物（意思就是这么小的幼儿不应该能吃到这种食物，是大人喂的）。第二段是反驳这个专家的结论，认为这个物种并没有对幼儿特别呵护，是从这个物种的另外一个分类的鸟恐龙的化石里找到的。

应该不是GWD的这篇了

-- by 会员 harryhuang (2010/8/12 20:53:08)

恩，谢谢啦！

harryhuang

好像应该不是这篇 这是最新的同学发的机经
阅读：有一个是说一种鸟恐龙，专家认为这个物种对幼儿时期特别呵护，因为脚骨没长全却从牙齿的化石里发现什么其他食物（意思就是这么小的幼儿不应该能吃到这种食物，是大人喂的）。第二段是反驳这个专家的结论，认为这个物种并没有对幼儿特别呵护，是从这个物种的另外一个分类的鸟恐龙的化石里找到的。

应该不是GWD的这篇了

-- by 会员 harryhuang (2010/8/12 20:53:08)

恩，谢谢啦！

-- by 会员 rdfyj (2010/8/12 21:19:52)

不用谢！！ 考试加油！