单项选择题

Have your files protected when working on the computer, ______ you might have them deleted by accident.
A) while C) so
B) and D) or

A．Have your files protected when working on the computer, ______ you might have them deleted by accident.
B．while
C．and
D．so
E．or
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单项选择题
The pictures and the song Yesterday Once More all ______ to his mind his previous days in Los Angeles. A) brought up C) brought about B) brought back D) brought forth
A．The pictures and the song "Yesterday Once More" all ______ to his mind his previous days in Los Angeles.
B．brought up
C．brought back
D．brought about
E．brought forth
单项选择题
It was so deep in the night. All was quiet ______ an occasional baby cry in the neighboring building. A) except for C) but B) except D) beside
A．It was so deep in the night. All was quiet ______ an occasional baby cry in the neighboring building.
B．except for
C．except
D．but
E．beside
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