SNMPV2弥补了SNMPV1的( )弱点。A．安全性 B．数据组织 C．性能管理

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, tears fell down 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 a great daughter like you."

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 does Mary give her mother?[ ]

A. The flower.

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 true? [ ]

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.

某无色溶液中含有H⁺、Al³⁺、Mg²⁺三种阳离子，逐滴加入0.1moL·L^-1 NaOH溶液，消耗NaOH溶液体积（X轴）和生成沉淀（Y轴）之间的函数关系如下图所示，则溶液中H⁺、Al³⁺、Mg²⁺三种阳离子的物质的量浓度之比为（   ）

A．1:1:1

B．2:2:1

C．2:1:1

D．1:1:2

下列各项中，除（）外，都可应用于抗衰老。

A.足三里

B.合谷

C.关元

D.百会

E.肾俞

胃癌最好发的部位是

A．胃窦大弯侧

B．幽门管

C．胃体大弯侧

D．胃窦小弯侧

E．贲门小弯侧

对各型癫痫都有一定疗效的药物是（）

A.乙琥胺

B.苯妥英钠

C.卡马西平

D.丙戊酸钠

E.苯巴比妥