什么是金属材料的变形？变形过程有哪三个阶段？

阅读理解。

     It was Mother's Day. A man stopped his car at a flower shop to order some flowers. He wanted the

shopkeeper to send the flowers to his mother, who lived two hundred miles away.

     As he got out of his car, he found a young girl sitting on the road crying.

     He asked her what was wrong and she replied, "I want to buy a red rose for my mother, but I only

have seventy-five cents. A rose costs two dollars."

     The man smiled and said, "Come into the shop with me, and I'll buy you a rose."

     He bought the little girl her rose and ordered his own mother's flowers. As they were leaving, he offered

to drive the girl home. She said, "Yes, please! You can take me to my mother." She brought him to a

cemetery (墓地), where she placed the rose on the grave.

     The man was moved. He returned to the flower shop, picked up the flowers he ordered, and drove two

hundred miles to his mother's house.

     Today is the day for your mother. Send a flower to your kind and beautiful mother.

1. The man went to the shop to _____.

A. have a rest

B. help the girl

C. buy some food

D. order some flowers

2. The man's mother lived _____ away from him.

A. 2 kilometers

B. 75 miles

C. 200 miles

D. 200 kilometers

3. The girl was crying on the road because _____.

A. she was hungry

B. she got hurt

C. she couldn't afford a rose

D. she couldn't find her way home

4. After the man bought the girl a rose, they went to _____ together.

A. the cemetery

B. his shop

C. the girl's home

D. his mother's house

5. We can learn from the passage that _____.

A. the girl loved flowers very much

B. the girl loved her mother very much

C. the shopkeeper sent the flowers to the man's mother

D. the man drove to his mother's house to look after her

可提示下壁心肌梗死的导联是（）。

A.V₁、V₂、V₃

B.Ⅱ、Ⅲ、aVF

C.V₁～V₅

D.Ⅰ、aVL

E.V₃～V₅

肝火犯肺，咯吐痰血，心烦易怒，胸胁刺痛，颊赤便秘，舌红苔黄，脉弦数。治宜选用

A．四生丸

B．咳血方

C．百合固金汤

D．清气化痰丸

E．补肺阿胶汤

6个月患儿，因发热、咳嗽1天，惊厥3次入院，体检：体温37.2℃，咽部充血，颅骨软化、前囟平坦。该患儿惊厥的原因可能是

A．改善心肺功能
B．保持呼吸道通畅
C．严格控制水、钾摄入
D．限制蛋白质摄入
E．多饮水卧床休息

脐部有可复性肿物，有正常皮肤覆盖，哭闹时胀满，安静时消失，可诊断为（）

A.脐膨出

B.脐疝

C.腹裂

D.脐炎

E.脐茸