皮皮学，免费搜题
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【单选题】
网段175.25.8.0/19的子网掩码是 ( )A.
.255.255.0.0
B.
255.255.224.0
C.
.255.255.24.0
D.
依赖于地址类型
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皮皮学刷刷变学霸
举一反三
【单选题】I ____ a precious book in a used book store. It became an important source of reference for my paper.
A.
stumbled upon
B.
stumble upon
C.
stumbled over
D.
stumble into
【单选题】Look! This is my new room, and that’s ______.
A.
John and his brother’s
B.
John's and his brother’s
C.
John and his brother
D.
John's and his
【单选题】Look! This is my new room, and that’s ______.
A.
John and his brother’s
B.
John's and his brother’s
C.
John and his brother
D.
John's and his
【单选题】After that, I found Morrie Schwartz, my25 professor, 25.
A.
lovely
B.
precious
C.
happy
D.
favorite
【单选题】I ____ a precious book in a used book store. It became an important source of reference for my paper.
A.
Stumble into
B.
Stumbled over
C.
Stumbled upon
D.
Stumble upon
【单选题】—Henry, ________ the light is ________ when you leave the lab. —All right. [ ]
A.
be sure; turned on
B.
make sure; turned off
C.
sure; turning off
D.
make sure; turning off
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