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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Just as the soil is a part of the earth,______the atmosphere.
A. as it is
B. so is
C. the same as
D. and so is
单项选择题
If each manager makes his usual speech, the meaning will be______for forty five minutes.
A. expanded
B. prolonged
C. delayed
D. exceeded
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