题目内容

Passage Three

A. The child seems sad.
B. His or her sadness lasts for a rather long period of time.
C. The child occasionally feels blue or down.
D. He or she feels life has its ups and downs.

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Passage One

A. Wearing some sports suit.
B. Having the right shoes.
C. Taking a bath after the exercise.
Drinking some water after the exercise.

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Passage Two

A. Because television is cheaper to purchase.
B. Because people could see the scene and the figures in movements.
C. Because television provides comfort to people.
D. Because television makes some actors and actress known to common people.

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Passage One

A. It can’t make people feel good.
B. People can’t sleep well after the exercise.
C. It makes people feel good.
D. It helps people lose weight.

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设A是n阶矩阵，α1，α2，…，αn是n维列向量，其中αn≠0，若Aα1=α2，Aα2=α3，…，Aαn-1=αn，Aαn=0．证明α1，α2，…，α3线性无关；

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Passage Three

A. The child seems sad. B. His or her sadness lasts for a rather long period of time. C. The child occasionally feels blue or down. D. He or she feels life has its ups and downs.

Passage One

Passage Two

Passage One

设A是n阶矩阵，α1，α2，…，αn是n维列向量，其中αn≠0，若Aα1=α2，Aα2=α3，…，Aαn-1=αn，Aαn=0． 证明α1，α2，…，α3线性无关；

A. The child seems sad.
B. His or her sadness lasts for a rather long period of time.
C. The child occasionally feels blue or down.
D. He or she feels life has its ups and downs.

设A是n阶矩阵，α1，α2，…，αn是n维列向量，其中αn≠0，若Aα1=α2，Aα2=α3，…，Aαn-1=αn，Aαn=0．证明α1，α2，…，α3线性无关；