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【单选题】
设向量组I：α1，α2， αr可由向量组Ⅱ：β1，β2， βs，线性表示，则(53)。A.
当r＜s时，向量组Ⅱ必线性相关．
B.
当r＜s时，向量组Ⅱ必线性相关．
C.
当r＜s时，向量组Ⅰ必线性相关．
D.
当r＜s时，向量组Ⅰ必线性相关．
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【单选题】听力原文：M: Hi! Jane, what have you been doing this summer holiday? W: Working, mostly. M: What kind of work have you been doing? W: I've been working in a hotel. M: What, as a waitress? W: No, I've been ...
A.
In a restaurant.
B.
In a hotel.
C.
In a supermarket.
D.
In a library.
【单选题】听力原文：M: Hi! Jane, what have you been doing this summer holiday? W: Working, mostly. M: What kind of work have you been doing? W: I've been working in a hotel. M: What, as a waitress? W: No, I've been ...
A.
In a restaurant.
B.
In a hotel.
C.
In a supermarket.
D.
In a library.
【单选题】听力原文：M: Hi! Jane, what have you been doing this summer holiday? W: Working, mostly. M: What kind of work have you been doing? W: I've been working in a hotel. M: What, as a waitress? W: No, I've been ...
A.
In a restaurant.
B.
In a hotel.
C.
In a supermarket.
D.
In a library.
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