单项选择题

The operation system （）.

A.manages the disks and files
B.manages the computer’s resources
C.manages the computer’s memory
D.All of the above

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It is a（）house.

A.little round wooden
B.round little wooden
C.wooden little round
单项选择题
It is more than six months now（）she left home and it will be another three days （）she returns home.

A.since；from
B.since；before
C.before；when
D.when；since
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