承台的作用是把多根桩连接成一个整体，共同承受上部（）。

阅读理解。回答问题。

     One day, I went to visit my aunt. When I was playing outside with the kids from the neighborhood, I

 saw a lovely dog. I was very happy and tried to catch it. But the dog ran away in the woods (树林). I ran

  after it and forgot my aunt's words -not to go far.

     Finally, I caught the dog. But when I looked around, I noticed that everything around me was dark and

  strange. I felt frightened and a little hungry.

     I walked for a long time, but I still couldn't find my way home. I was very tired and sat under a tree.

 Suddenly, I found that the dog was missing again. At that moment, a policeman appeared (出现) in front

  of me, sitting on a motorbike with the dog. He said the dog took him there and then he drove me back to

  my aunt's house.

     I felt thankful to the dog and gave it some delicious bones. Then I set it free again. Who knows, maybe

  it would help out another little lost boy back to his family. 

1. Who did the writer play with at first?

     ______________________

2. What did the writer's aunt tell him? 

    ______________________

3. What was like in the woods?

    ______________________

4. How did the writer come back to his aunt's home?

    ______________________

5. Did the writer keep the dog at home from then on? 

    ______________________

现在的主流CPU处理速度(用主频表示)能够达到1______量级。

A．K

B．M

C．G

D．T

病历摘要：男性，30岁。主诉：右视力下降1个半月，自觉右眼前有黑影，视物发暗变形，无眼红、眼痛史。三年前左眼曾有同样情况，经治疗约一年视力有恢复。最近患者工作紧张。检查：视力右4.6（0.4)，左4.9（0.8)。双外眼未见异常。屈光间质清晰。小瞳眼底检查：双眼视 * * 正常，视网膜动脉稍细，静脉正常，右眼黄斑部稍隆起，有黄白色点状物，左眼黄斑部色素紊乱、中心凹光反射暗淡。

提问：有关本病的预后，下列叙述正确的是（）。

A.是一种良性病变

B.多数能自愈

C.药物治疗不能改善预后

D.激光治疗只能缩短病程，不能改善预后

E.多次复发或病程持续较久，可致永久性视力减退

F.大多数病人的视力可恢复到原有水平

G.极少数病人会发生黄斑囊样变性

H.少数患者将继发视网膜脱落

I.如不治疗，最终将导致患眼失明的可能性大

J.大多数病例的视力不能恢复到原有水平

从前鼻棘至蝶窦前壁的距离一般不超过（）。

A.5cm

B.6cm

C.7cm

D.8cm

E.9cm

对肺泡气分压变化起缓冲作用的肺容量是（）。

A.补吸气量

B.补呼气量

C.深吸气量

D.余气量

E.功能残气量