--Is it OK to take this seat?
-- Sorry, _________.
A.here you are
B.take it
C.it's taken
D.never mind
第1题:
—It’s cold today. You’d better _________ your sweater.
—OK. I will.
A. put on B. turn on C. get on
第2题:
第3题:
I put my coat here? Sorry, you()
AMay; mustn't
BDo; don't
Ccan; needn't
DMay; can't
第4题:
---- Sorry, I have to ______ now. It’s time for class.
---- OK, I’ll call back later.
A. hang up B. break up C. give up D. hold up
第5题:
第6题:
矩阵A=Array[a,{4,5}],取第1,4两行,2,3,5列元素的子矩阵,使用语句是
A.Part[A,{1,4},{2,3,5}]
B.Take[A,{1,4},{2,3,5}]
C.Part[A,{2,3,5},{1,4}]
D.Take[A,{2,3,5},{1,4}]