To be a good teacher, you need some of the gifts of a good actor; you must be able to hold the attention and interest of your audience; you must be a clear speaker, with a good, strong, pleasing voice which is fully under your control; and you must be able to act what you are teaching, in order to make its meaning clear.

Watch a good teacher, and you will see that he does not sit still before his class： he stands the whole time he is teaching; he walks about, using his arms, hands and fingers to help him in his explanations, and his face to express feelings. Listen to him, and you will hear the loudness, the quality (音色) and the musical note of his voice always changing according to what he is talking about.

The fact that a good teacher has some of the gifts of a good actor doesn’t mean that he will indeed be able to act well on the stage, for there are very important differences between the teacher’s work and the actor’s. The actor has to speak words which he has learnt by heart; he has to repeat exactly the same words each time he plays a certain part, even his movements and the ways in which he uses his voice are usually fixed beforehand (预先). What he has to do is to make all these carefully learnt words and actions seem natural on the stage.

A good teacher works in quite a different way. His audience takes an active part in his play: they ask and answer questions, they obey orders, and if they don’t understand something, they say so. The teacher therefore has to meet the needs of his audience, which is his class. He cannot learn his part by heart, but must invent it as he goes along.

I have known many teachers who were fine actors in class but were unable to take part in a stage-play because they could not keep strictly to what another had written.

51. What is the text about ?

A. How to become a good teacher.

B. What a good teacher should do outside the classroom.

C. What teachers and actors could learn from each other.

D. The similarities and differences between a teacher’s work and an actor’s.

52. The word “audience” in the fourth paragraph means ____ .

A. students                      B. people who watch a play

C. people who not on the stage     D. people who listen to something

53. A good teacher ____ .

A. knows how to hold the interest of his students

B. must have a good voice

C. knows how to act on the stage 

D. stands or sits still while teaching

54. In what way is a teacher’s work different from an actor’s ?

A. The teacher must learn everything by heart .

B. He knows how to control his voice better than an actor .

C. He has to deal with unexpected situations .

D. He has to use more facial expressions .

55. The main difference between students in class and a theatre audience is that ____.

A. students can move around in the classroom

B. students must keep silent while theatre audience needn’t

C. no memory work is needed for the students

D. the students must take part in their teachers’ plays

注意：下面出现的“考生文件夹”均为%USER%。

在考生文件夹中存有文件名为Java_3.java和Java_3.html文件，本题的功能是由用户输入两个浮点数求和。请完善Java_3.java文件和Java_3.html文件，并进行调试(在命令行中使用appletviewer Java_3.html，或者使用集成开发环境)，程序先显示输入如下：

输入两个浮点数后，小程序窗口显示结果如下：

由于Java_3.java和Java_3.html文件都不完整，需分别进行修改，请在注释行“//*********Found*********”下一行语句的下画线地方填入正确内容，然后删除下画线，请勿删除注释行或其他已有语句内容。存盘时，文件必须存放在考生文件夹下，不得改变原有文件的文件名。

给定源程序：

import Java.awt.Graphics;

import Javax.swing.*;

//*********Found**********

public class Java_3 extends______

double sum;//存和的变量

//*********Found**********

public void______()

String firstNumber,//输入第1个字符串格式的数

secondNumber;//输入第2个字符串格式的数

double number1,//加数

number2;//被加数

//读入第1个输入的数

firstNumber=

JOptionPane showInputDialog(

"Enter first floating-point value");

//读入第2个输入的数

secondNumber=

JOptionPane.showInputDialog(

"Enter second floating-point value");

//将字符串数据转换成双字长类型

number1=Double.parseDouble(firstNumber);

number2=Double.parseDouble(secondNumber);

//数据相加

sum=number1+number2;

public void paint(Graphics g)

//用g.drawString给结果

g.drawRect(15,10,270,20);

g.drawString("数相加之和为:"+sum,25,25);