解方程组y=2x-1①y=x2②．

对4FeCl₂＋4Na₂O₂＋6H₂O＝4Fe(OH)₃↓＋O₂↑＋8NaCl，下列说法错误的是

A．Fe(OH)₃既是氧化产物又是还原产物

B．氧气是氧化产物

C．做氧化剂的过氧化钠和做还原剂的过氧化钠物质的量之比为3:1

D．过氧化钠只做氧化剂

由于拔牙创口感染而导致的继发性出血常发生在（）

A.拔牙24小时后

B.拔牙48小时后

C.拔牙72小时后

D.拔牙1周后

E.拔牙3～5天后

阅读理解。

     People say teenagers are no good. They make too much noise in shopping malls; they drive recklessly

up and down America's main streets; they carry chips on their shoulders as big as the Sears Tower. And

at least some of the time those things are true. But we shouldn't forget that there are hard moments in the

life of a teenager too.

     I watched such a moment not long ago at a woman's funeral. I didn't expect the event to affect me.

Through much of the ceremony, in fact, I remained unmoved.

     The teenage grandson stepped forward. With his very first deep breath, every heart in that church was achingly reminded of something we had all forgotten. Softly he began: "I want to share a few values that

Nana taught me. She never failed to see light in any situation. When our family dog would truly attack her, what would Nana say? 'oh, what beautiful barking that dog has!' That was Nana. "

     "She was a strong woman who often lived in the shadow of my grandpa, who was a successful

businessman in this city. But she was the one behind the scenes who provided the strength and support

for my grandpa's career," he said, with a voice now trembling, "That was Nana's way."

     Through a low sob, he continued, "Whenever she did anything worth recognition, you'd have to hear

about it from a different source, because she was never one to show off."

     Finally, in a voice breaking free of sorrow, he looked up and said, "Nana taught me courage. She put

up an incredible fight to the end, when she died peacefully, which is how she lived her life. That was

Nana's way, and I hope I can carry on in the same manner."

     There are no hearts as sensitive as those of teenagers, because everything is happening to them for the

first time. The trouble with teenagers is that they haven't learned to be controlled.

When that boy rose to speak about the woman who surely had been his truest and best friend, his honest

voice dragged each of us out into the open where we could no longer hide in the calm ceremony. He

exposed us to the truth about this very real woman who believed in a boy who probably tried the

patience of many adults. He reminded us that his grandmother was more than another dot on the chart of

life and death.

     All over again we felt those powerful losses crossing our own hearts, and we knew that when you say

good-bye to something happy, something young in yourself. And that something never really returns, and

the pain never really goes away.

1. In the first paragraph, the writer gave some examples to________ .

A. support his idea that young people are no good

B. introduce his point of view about young people

C. tell people every coin has its two sides

D. show young people often make mistakes

2. From the boy's speech, we know _______ .

A. his grandmother had great influence on him

B. they had a dog which often attacked people

C. people had forgotten her until the boy appeared

D. his grandmother was so weak that she is always living in the shadow of his grandpa

3. Which of the following statements is true?

A. The boy 's speech moved no one present at the funeral except the writer

B. The boy's being good at expressing himself enabled him to draw everyone's attention

C. The boy was too grieved to accept the fact that his grandmother had passed away

D. The writer didn't expect the event would affect him

4. What words can best describe grandmother's quality?

A. Weak, mild and modest

B. Easygoing, cautious and considerate

C. Sensitive and hard on others

D. Patient, optimistic, strong and helpful.

5. The passage tells the readers_______ .

A. facing certain bitter facts help young people to grow

B. young people have to control themselves

C. the adults should learn from the young

D. the adults should teach the young how to be brave    

依据《国家电网公司电网建设项档案管理办法》，建设管理单位在完成职责范围内工作后（）月内，向项目法人移交项目法人应当归档保管的项目档案；在项目竣工投产后（）月内，向运行单位移交属于运行单位应当归档保管的项目档案。

A.1；2

B.2；3

C.3；3

D.1；3

古人将眼之黑睛和晶珠的病变统称为（）