题目内容

矩阵乘法规律A(B+C)=AB+AC

A. 对
B. 错

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矩阵乘法规律k(AB)=(kA)B

A. 对
B. 错

I just want to hear your ____________.

A. voice
B. sound
C. noise
D. vest

I didn't go to any Halloween parties this year, I wasn't really in the ______.

A. would
B. mood
C. model
D. mock

Hey, Sam,_______on one second, please.

A. hold
B. told
C. held
D. hole

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