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我今天很偶然做了一篇阅读，跟关于polarbeer的那篇非常相似，现在先把问题和答案发上来，如果确定一样和有需要的话，改天再把原文奉上。 1) What aspect of polar bears does the lecturer mainly discuss? ->Their adaptation to the extreme physical environment. 2) What does the professor say about the color of polar bear's fur? ->It looks white but is actually completely clear. 在原文中，教授问是什么颜色，一个女学生说很明显，是白色，但是教授回答，“but it's actually completely pigment-free,colorless” 3)Why do some people think that the camouflage theroy is wrong? -> olar bears primarily hunt in the dark. 4)Why does the professor mention the infra-red photographs? ->To demonstrate the polar bear's ability to retain heat. Listen again to part of the lecture.Then answer the question. P:I kind of fall into the second camp.Yoo see,the clear strands allow the weak sunlight to penetrate through to the black skin.So,they absorb and transform the warmth into body heat,and this heat gets trapped in and stored by the fat and fur. 5)What does the professor mean when she says this I kind of fall into the second camp. ->She doesn't agree with the camouflage theory. Listen again to part of the lecture.Then answer the question. P:Ah,polar bears adapted to these conditions by developing the ability to slow their metabolism down by walking slowly for extended periods.You know in these periods they sort of go without food,and draw energy from their stores of fat…I guess this is a feature that most people would envy.原文中的这段前部分讲的就是冬眠的事，polar bear也冬眠，而且它们的冬眠很特别，叫“walking hibernation”。polar bear冬天不缺食物，但是夏天缺，所以它们就用这种方式冬眠。 6)What does the professor mean when she says this I guess this is a feature that most people would envy. ->The polar bear's way of storing nutrition is extremely efficient. | 
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发表于 2006-8-28 12:12:00
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