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【单选题】
听力原文：What kind of room will the man have? (12)A.
A single room without bath and shower.
B.
A double room with bath and shower.
C.
A double room without bath and shower.
D.
A single room with bath and shower.
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举一反三
【单选题】Consider a linear system whose augmented matrix is of the form which of the following statements hold such that the system will have infinitely many solutions?
A.
a=0,b=0
B.
a=0,b≠0
C.
a≠0,b=0
D.
a≠0,b≠0
【多选题】Consider a linear system whose augmented matrix is of the form ,which of the following statements hold such that the system must have the unique solution?
A.
a=5, b≠4
B.
a=5, b=4
C.
a≠5, b≠4
D.
a≠5, b=4
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