单项选择题

Have your files protected when working on the computer, ______ you might have them deleted by accident.

A．while
B．and
C．so
D．or
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单项选择题
A clear head is of primary importance in ______ urgent situations like this.
A．dealing
B．disposing
C．coping with
D．proceeding with
单项选择题
The disabled children need many things, but ______, they need love.
A．first of all
B．above all
C．after all
D．all in all
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