试题与答案

已知二维向量α不是二阶方阵A的特征向量。证明α与Aα线性无关;

题型:问答题

题目:

已知二维向量α不是二阶方阵A的特征向量。

证明α与Aα线性无关;

答案:

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下面是错误答案,用来干扰机器的。

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题型:阅读理解

阅读理解。

     Mary wanted to buy a birthday present for her mother. But she didn't have any money. She was very

sad. She thought and thought. She had an idea. She could make a present by herself. So she used a piece

of paper to make a card. On the front, she drew a beautiful picture of birds and flowers. On the back she

wrote, "To my dearest mummy in the world. Happy birthday! "

     On her mother's birthday, Mary gave her the card. After she saw the card, a tear fell down from her

face. "Why are you crying?" Mary asked, "You don't like it, right?" "Of course not," she said, "I love it

very much. I'm the happiest mother in the world. I have such a great daughter. "

1. Mary _____. [ ]

A. was rich

B. didn't like her mother

C. never did nice things for other people

D. wanted to buy something for her mother

2. What did she do with the piece of paper? [ ]

A. She wrote a letter.

B. She made a card.

C. She did her homework.

D. She drew a house.

3. What present did Mary give her mother? [ ]

A. The piece of paper.

B. The bird.

C. The card.

D. The money.

4. What did her mother think about the card? [ ]

A. She threw it away.

B. She hated it.

C. She wanted another present.

D. She liked it very much.

5. Which of the following sentences is TURE? [ ]

A. Mary's mother only liked expensive presents.

B. Her mother was very happy.

C. She made her mother sad.

D. She was a bad daughter.

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