题目内容

Greenland, ________ island in the word, covers over two million square kilometers.

A. it is the largest
B. that is the largest
C. is the largest
D. the largest

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Ann doesn't work ____ she used to.

A. hard than
B. as harder as
C. as hard as
D. more harder than

若向量组 a , b , g 线性无关, a , b , d 线性相关, 则( ).

A. a 必可由 b , g , d 线性表示
B. b 必不可由 a , g , d 线性表示
C. d 必可由 a , b , g 线性表示
D. d 必不可由 a , b , g 线性表示

若一组向量的和为零向量,则它们必线性相关. ( )

A. 对
B. 错

若向量组α1,…,αr线性无关,则它的任意一部分向量也线性无关。( )

A. 对
B. 错