单项选择题

What are the audiences needed to do?
A．Discard their old computers
B．Erase all files from their old computers
C．Update all their files
D．Copy their files

A.Discard
B.Erase
C.Update
D.Copy

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What are the audiences requested to do?
A．To refrain from taking pictures
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D．To stay with the group at all time

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