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【简答题】
已知矩阵A= 2 1- a 2 1 a+1 是不可逆矩阵，则实数a的值是______．
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【简答题】S: May I help you? A: Yes, _______ some foundation.
【单选题】—May I help you? You seem to be having some problems.— , thanks. I think I can manage.
A.
All right
B.
No problem
C.
It，s all right
【单选题】— Time is money. — But I think it is _____ money. [ ]
A.
as important as
B.
so important as
C.
more important than
【简答题】听力原文：A: Hello. How may I help you? S: Hello. My name is Martina Bila. I made an appointment to see you at 10 o'clock. I'm a little early. Is that OK? A: No problem. We're not very busy at the moment. ...
【单选题】--This digital camera is really cheap! --The __________ the better. Im short of money, you see.
A.
cheap
B.
cheaper
C.
expensive
D.
more expensive
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