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【单选题】
Maria calls Aya because she wants to _______.A.
go to a festival
B.
do a project on a festival .
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反馈参考答案：
举一反三
【判断题】As a speaker, if you don’t know the answer to a particular question, just ignore the question and move on to the next one.
A.
正确
B.
错误
【单选题】If you don’t like the talk going on, you may say:_______.
A.
“So much for today”
B.
“Let’s stop today”
C.
“Well, it’s going late. I think we can continue the discussion next time”
【简答题】设A是n阶实对称正定矩阵，则由格式(2.21)得到的向量序列{r (k) }和{z (k) }满足 [r (k) ，z (k-1) ]=0，[r (k) ，r (l) ]=0，[z (k) ，Az (l) ]=0(k≠l)．(2.22)
【单选题】If you don’t put the milk in the refrigerator，it may__________ ． A.go byB.go off#
A.
If you don’t put the milk in the refrigerator，it may__________ ． A.go by
B.
go off
C.
go on
D.
go back
【判断题】As a speaker, if you don’t know the answer to a particular question, just ignore the question and move on to the next one.
A.
正确
B.
错误
【单选题】If you don’t keep the meat in the refrigerator on such a hot day, it may ____.
A.
go out
B.
go away
C.
go off
D.
go down
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