单项选择题

A．The speaker’s former classmate.
B．The speaker’s Colleague.
C．The woman in the photograph.
D．The young girl in the photograph.
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单项选择题
A．To create artificial bone tissue.B．To learn how to prevent a bone disease.C．To find out how specialized bone cells have evolved.D．To understand differences between bone tissue and other tissue.
A．To create artificial bone tissue.
B．To learn how to prevent a bone disease.
C．To find out how specialized bone cells have evolved.
D．To understand differences between bone tissue and other tissue.
单项选择题
A．It defined easy words as well as hard ones.B．Nothing more than a list of difficult words.C．Present good sentences to show how each word was actually used in speech and in writing.D．It was the greatest improvement in the quality of dictionaries.
A．It defined easy words as well as hard ones.
B．Nothing more than a list of difficult words.
C．Present good sentences to show how each word was actually used in speech and in writing.
D．It was the greatest improvement in the quality of dictionaries.
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