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【单选题】
设A为5阶方阵，且行列式|A|=1，则|-2A|之值为( )。A.
2
B.
-2
C.
-32
D.
32
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反馈参考答案：
举一反三
【单选题】Mike _______ in touch with his former schoolmates, who had been living there for ages, as soon as he arrived in America. [ ]
A.
is bound to get
B.
set about getting
C.
get down to get
D.
set out getting
【单选题】Mike _______ in touch with his former schoolmates, who had been living there for ages as soon as he arrived in America.
A.
set about to get
B.
set out getting
C.
set out get
D.
set about getting
【单选题】He had been _______ good terms with Tom, but all of ____ sudden they lost in touch with each other.
A.
on ; a
B.
in ; /
C.
on ; the
D.
in ; a
【单选题】He ______ chess well. But since he graduated from university, he almost has had no time to touch it.
A.
played
B.
plays
C.
has played
D.
had played
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