简述英伽登文学作品的层次理论。

已知线段AB=5厘米，线段BC=3厘米，则线段AC的长为（　　）

A．8厘米

B．2厘米

C．2厘米或8厘米

D．不能确定

阅读理解。

     One day an old woman was traveling alone in the mountains. Suddenly she saw something shining in the

stream. When she came close, she found it was a precious stone. She put the stone into her bag and went on

with her trip.

     The next day the old woman met a young man, who was also a traveler in the mountains. The young man

looked very hungry, so the old woman opened her bag to share her food. The hungry traveler saw the precious

stone and asked carefully, "The stone is beautiful. Would you like to give it to me?"

     "Sure. Why not?" the woman said, and handed the stone to him.

     The young man left happily with the stone. He knew it was worth enough to give him security for a lifetime.

But a few days later he came back to return the stone to the woman.

     "I've been thinking," he said. "I know how valuable the stone is, but I give it back and hope that you can give

me something even more precious. Give me what you have within your bag."

     The woman opened her bag. It was almost empty. She looked at the young man and smiled, "I have nothing

special in my bag, but I do have something precious-the joy of giving!"

     The young man felt ashamed and left silently.

1. How did the young man find the precious stone? [ ]

A. He found it in his food.

B. He dug it out in a valley.

C. He saw it in the woman's bag.

D. He noticed it shining in the stream.

2. What does the underlined word "security" in Paragraph 4 probably mean? [ ]

A. Money.

B. Worry.

C. Health.

D. Trouble.

3. The man returned the stone to the woman because _____. [ ]

A. he found the stone was not precious

B. he understood the real meaning of joy

C. he felt embarrassed at taking away the stone

D. he wanted to get something even more precious

4. Which of the following would be the best title of the passage? [ ]

A. A special stone

B. The joy of giving

C. A woman and a young man

D. An experience in the mountains

4C观念中的成本是指消费者满足自己的需要和欲望所肯付出的（）。

男，23岁，口服乐果40ml入院。神清，经洗胃和阿托品56mg治疗后，瞳孔散大，烦躁不安，皮肤潮红，心率136次/分，肺基部仍有散在湿性啰音，有尿潴留。下列措施最重要的是（）

A.阿托品减量继续观察

B.停用阿托品继续观察

C.纠正水盐代谢失衡

D.导尿

E.适当给予解磷定治疗