搜题请搜索小程序“爱下问搜题”
问题 选择题

--Mum, where is my toy car? You promised.

--_____, my dear, but you know mum is pretty busy today. Tomorrow, OK?

A．So it is

B．So is it

C．So did I

D．So I did

答案

答案：D

考查：so +主语+助动词，表示对上句话的肯定。根据“You promised.”你答应的。所以助动词应用did ，So I did 意为我是答应过。

单项选择题

中心距较大，温度不高又要求传动平动应采用（）传动。

A、链

B、带

C、齿轮

D、蜗杆
查看答案
问答题

本题中，主窗口有一个按钮“打开对话框”和一个文本域，单击按钮“打开对话框”后会弹出一个对话框，对话框上有两个按钮“Yes”和“No”，单击对话框上的“Yes”和“No”按钮后返回主窗口，并在右侧文本域中显示刚才所单击的按钮信息。
import java.awt.event.*;
import java.awt.*;
class MyDialog______implements ActionListener
static final int YES=1,NO=0;
int message=-1;Button yes,no;
MyDialog(Frame f,String s,boolean b)
super(f,s,b);
yes=new Button("Yes");yes.addActionListener(this);
no=new Button("No");no.addActionListener(this);
setLayout(new FlowLayout());
add(yes);add(no);
setBounds(60,60,100,100);
addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent e)
message=-1;setVisible(false);
);

public void actionPerformed(ActionEvent e)
if(e.getSource()==yes)
message=YES;
setVisible(false);

else if(e.getSource()==no)
message=NO;
setVisible(false);


public int getMessage()
return message;


class Dwindow extends Frame implements ActionListener
TextArea text;Button button;MyDialog dialog;
Dwindow(String s)
super(s);
text=new TextArea(5,22);button=new Button("打开对话框");
button.addActionListener(this);
setLayout(new FlowLayout());
add(button);add(text);
dialog=new MyDialog(this,"Dialog",true);
setBounds(60,60,300,300);setVisible(true);
validate();
addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent e)
(System.exit(0);
);

public void actionPerformed(ActionEvent e)
if(e.getSource()==button)
______;
if(dialog.getMessage()==MyDialog.YES)
text.append("n你单击了对话框的yes按钮");

else if(dialog.getMessage()==MyDialog.NO)
text.append("\n你单击了对话框的No按钮");




public class java2
public static void main(String args[])
(new Dwindow("java2");
查看答案