下列关于质量的说法正确的是     [ ]

A. 一块冰熔化成水时，质量发生了变化    

B. 月球上的石头拿到地球上，质量将变大   

C. 1.7×10^-4 吨可能的是一只鸡的质量

D.同一物体的质量不随温度的变化而变化

[说明]
以下程序实现了利用鼠标任意移动圆形的位置，仔细阅读代码和相关注释，将程序补充完整。
[代码6-1]
import java.awt.*;
import java.awt.event.*;
public class CIUSAMPLE extends Frame implements MouseMotionListener, MouseListener

static CIUSAMPLE frm=new CIUSAMPLE ( );
int x=70,y=60,posX=70,posY=60,dx,dy;
public static void main (String args[])

frm.setTitle ("Dragging a circle");
frm.setSize (200,150);
(1)
ffm.addMouseMotionListener (frm);
frm.setVisible (true);

public void mousePressed (MouseEvent e)

(2)
dy=e.getY ( ) -posY;

public void mouseDragged (MouseEvent e)

(3)
y=e.getY ( ) -dy;
if(dx＞0&&dx＜50&&dy＞0&&dy＜50) //如果指针落在正方形区域内

Graphicsg=getGraphics ( );
(4)


public void paint (Graphics g)

g.setColor (Color.pink); //设置绘图颜色为粉红
g.fillOval(x,y,50,50); //以基准点为图形在左上角绘出圆形
(5)
posY=y；

public void mouseMoved (MouseEvent e)
public void mouseReleased (MouseEvent e)
public void mouseEntered (MouseEvent e)
public void mouseExited (MouseEvent e)
public void mouseClicked (MouseEvent e)