单项选择题

These samples have to be () in certain kind of chemical water in order to protect them.

A. immersed
B. crisped
C. armored
D. arrayed

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单项选择题
In most countries, the metric system has been ______ for all measurement.
A. admitted
B. adapted
C. applied
D. adopted
单项选择题
The man went to prison, but the two boys () with a warning.

A. took off
B. got off
C. kept off
D. set off
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