单项选择题


A．fell
B．took
C．relied
D．lived
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单项选择题
A．fragmentB．sliceC．segmentD．portion
A．fragment
B．slice
C．segment
D．portion
单项选择题
The book gives a brief ________ of the course of his research up till now.
A．outline
B．reference
C．frame
D．outlook
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