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六级练习2012.01.12


       
       



W: Hi, Mike.
M: Hi, Mary. I overslept again!This really is becoming a bad habit.What did Professor Brown talk about today?
W: We talked about George Washington's false teeth.
M: Oh! All I know is that they were made of wood.
W: Well, that, it turns out, is a myth.A famous professor at a dental school in California recently presented a paper showing that (1)___________________________________________.
M: But why do people say that Washington's teeth were made out of wood?
W: A set of his teeth that were made out of elephant ivory was displayed in exhibitions around the country about a hundred years ago.The ivory had turned a very dark color and I guess it's like wood.
M: Oh, yes. I've seen ivory that has a dark brown color.
W: (2)____________________________________________.I guess that's how the story got started.
M: What's this about cow's teeth?
W: You know, cows have teeth just on their bottom jaws.(3)_________________________________________.So they too, at one time, were used to make false teeth.
M: That's really interesting.Well, this will certainly teach me not to oversleep again.I do wonder what little-known facts Professor Brown will have for us next week.



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Washington's teeth were made out of the things including, can you imagine? elephant ivory and cow's teeth, but not wood.
It seems that the ivory stands quite easily with age, especially if it is exposed to drinking, such as coffee, tea, or wine.
After about 5 years of fighting grass off against their ..job, the bottom teeth will down into the shape of human teeth
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