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A、California dental schools. B、A little-known fact about George Washington. C、Uses of animals in research. D、George Washington’s
A、California dental schools. B、A little-known fact about George Washington. C、Uses of animals in research. D、George Washington’s
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2010-08-04
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问题
W:Hi,Mike! You missed a great history lecture this morning.Where were you?
M: Oh, I overslept again. This really is becoming a bad habit. What did Professor Brown talk about today?
W: Can you believe it? We talked about George Washington’s false teeth.
M: All I know is that they were made of wood.
W: A professor at a dental school in California recently presented a paper showing that Washington’s teeth were made of many things, including, can you imagine, elephant ivory and cow’s teeth, but not wood.
M: But why do people say Washington’s teeth were made of wood?
W: A set of his teeth that were made of elephant ivory were shown publicly at various exhibitions about a hundred years ago. The ivory had turned a very dark color, and I guess, looks like wood.
M: Yes, I’ve seen some ivory that was dark brown color.
W: It seems that ivory turns dark easily with age, especially if it’s exposed to drinks, such as coffee, tea, or wine. I guess that’s how the story got started.
M: What’s about cow’s teeth?
W: You know cows have teeth just on their bottom jaws. After about five years of biting grass off against their hard up- per jaws, the bottom teeth wear down into the shape of a human tooth.
选项
A、California dental schools.
B、A little-known fact about George Washington.
C、Uses of animals in research.
D、George Washington’s sleep habits.
答案
B
解析
主旨大意题。在对话开始部分女士就提到了今天的历史课讨论华盛顿的假牙,而关于华盛顿假牙的真实情况鲜为人知,因此选项B是本对话的主旨。
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0
大学英语四级
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