单项选择题

It was not very long () scientists applied the technique to other species.

A、while
B、then
C、before
D、after
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单项选择题
They sell() , such as cotten cloth, silk cloth, and woolen cloth.
A、clothes
B、cloth
C、cloths
D、clothing
单项选择题
Data and program instructions are stored in ()
A、output
B、the processor
C、storage
D、program
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