酶的必需基团是指（） A.酶的辅酶部分 B.与酶催化功能有关的基团 C.一些金属离子

某物体在粗糙水平面上受一水平恒定拉力F作用由静止开始运动，下列四幅图中，能正确反映该物体运动情况的图像是   

三、阅读理解（2分/题，共分30分）

Most dog owners feel that their dogs are their best friends. Almost everyone likes dogs because they try hard to please their owners. One of my favorite stories is about a dog who wanted his owner to please him.

　　One of my friends has a large German shepherd ( 牧羊狗) named Jack. Every Sunday afternoon, my friend takes Jack for a walk in the park. Jack likes these long walks very much.

　　One Sunday afternoon, a young man came to visit my friend. He stayed a long time, and he talked and talked. Soon it was time for my friend to take Jack for his walk, but the visitor didn’t leave. Jack became very worried about his walk in the park. He walked around the room several times and then sat down directly in front of the visitor and looked at him. But the visitor paid no attention. He continued talking. Finally, Jack couldn’t stand it any longer. He went out of the room and came back a few minutes later. He sat down again in front of the visitor, but this time he held the man’s hat in his mouth.

　　German shepherds aren’t the only intelligent dogs. Another intelligent dog is a Seeing Eye dog. This is a special dog which helps blind people walk along the streets and do many other things. We call these dogs Seeing Eye dogs because they are the “eye” of the blind people and they help them to “see”. Seeing Eye dogs generally go to special schools for several years to learn to help blind people.

36. The writer tells the story about the dog Jack to show that____.

　　A. it always tried to please its master like many other dogs

　　B. it always wanted its master to please it unlike many other dogs

　　C. it was more intelligent than many other dogs

　　D. it was the most faithful dog of his friend’s

37. Jack came to sit in front of the visitor in order to______.

A. please him     B. be pleased    C. ask him to leave immediately   D. invite him for a walk

38. The underlined sentence “Finally, Jack couldn’t stand it any longer.” Means______.

　　A. Jack could no longer put up with the visitor

　　B. Jack could no longer stand but he might sit down

　　C. Jack was very tired and wanted a rest

　　D. Jack was very angry with the owner

39. Seeing the dog holding his hat in its mouth, the visitor would probably______.

A. think the dog was foolish and boring

B. kicked the dog away by himself

C. beat the dog in front of its owner

D. get up and say good-bye to his friend

40. Which of the following titles would be the best for the passage?

A. Dogs─A Great Help to People

B. Dogs ─ Our Faithful Friend

C. An Introduction to Dogs

D. Famous Dogs in Germany

患儿，3岁。眼睑及双下肢明显水肿，少尿1周。体检：精神状态尚好，眼睑水肿，双下肢呈凹陷性水肿，血压12/8kPa（90/60mmHg），心肺正常，尿常规：蛋白（+++），红细胞0～3个/HP，血浆总蛋白45g/L，蛋白22g/L，抗"O"正常，C3补体正常，胆固醇11.2mmol/L。

该患儿治疗宜选（）

A.泼尼松短程疗法

B.泼尼松中程疗法

C.泼尼松长程疗法

D.甲泼尼龙冲击疗法

E.泼尼松+环磷酰胺

F.利尿剂

G.预防用抗生素

H.补充钙剂及维生素D

根据需要，异步电动机应装设低电压保护时，其电压动作值一般为电动机额定电压的( )。

A．60%～70%
B．60%～75%
C．65%～75%
D．70%～80%

说明看记录时看道要达到什么目的？