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.
发表于 2016-2-22 10:05
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