单项选择题

First published in 1927, the charts remain an _____ source for researchers.

A．intelligent
B．indispensable
C．inevitable
D．identical
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单项选择题
A．personB．humansC．creaturesD．adult
A．person
B．humans
C．creatures
D．adult
单项选择题
The worker wants a _____ to another post.
A．transform
B．transit
C．transfer
D．transmit
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