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【单选题】
Matlab语言中，已知变量A=[1 2 3; 4 5 6; 7 8 9], B=flipud(A)，则变量B为：A.
[3 2 1; 6 5 4; 9 8 7]
B.
[3 6 9; 2 5 8; 1 4 7]
C.
[7 8 9; 4 5 6; 1 2 3]
D.
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反馈参考答案：
举一反三
【简答题】听下面一段对话，完成第1至2题。 1. Who is supposed to attend the meeting? A. Sam. B. John. C. Tom. 2. When does the meeting start? A. At 3:30. B. At 3:15. C. At 3:00.
【单选题】Peter was so excited _______ he received the invitation to the important meeting.
A.
that
B.
though
C.
when
D.
before
【单选题】Could you tell me_______ yesterday afternoon?
A.
when the meeting ended
B.
when did the meeting end
C.
when ended the meeting
D.
when the meeting did end
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