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【单选题】
设A是m×n阶矩阵，下列命题正确的是( )．A.
若方程组AX=0只有零解，则方程组AX=b有唯一解
B.
若方程组AX=0有非零解，则方程组AX=b有无穷多个解
C.
若方程组AX=b无解，则方程组AX=0一定有非零解
D.
若方程组AX＝b有无穷多个解，则方程组AX＝0一定有非零解
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【单选题】Tom likes cars. He enjoys______ model cars of all kinds.
A.
collects
B.
collecting
C.
to collect
D.
collected
【单选题】Daming likes cars. He enjoys _____ models cars of all kinds.
A.
making
B.
make
C.
to make
D.
made
【单选题】Tom likes cars. He enjoys _________ model cars of all kinds.
A.
collect
B.
collecting
C.
collected
D.
collection
【单选题】Tom likes to play _____ football but Jim likes to play_____ piano. [ ]
A.
a, a
B.
the, he
C.
the, /
D.
/, the
【单选题】Sam likes cars. He enjoys _______ all kinds of model cars. . [ ]
A.
collects
B.
collecting
C.
to collect
D.
collected
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