单项选择题

It was the first time that such a ______ had to be taken at a British nuclear power station.

A. presentation
B. precaution
C. preparation
D. prediction
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单项选择题
To speed up the ______ of letters, the Post Office introduced automatic sorting.
A. treatment
B. delivery
C. transmission
D. departure
单项选择题
First published in 1927, the charts remain an______ source for researchers.
A. identical
B. indispensable
C. intelligent
D. inevitable
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