中枢神经系统白血病最常见于（）

A．急淋白血病确诊时

B．急淋白血病缓解时

C．急粒白血病确诊时

D．急粒白血病缓解时

E．急单白血病确诊时

【说明】本程序实现功能：读入两个整数，第1个数除以第2个数，声明当除数为零时抛出异常类DivideByZeroException。
public class DivideByZeroException (1)
public DivideByZeroException ( )
super("Attcmpted to divide by zero");


import java.io. *;
public class Example
private static int quotient(int numerator, in)\”t denominator) throws
DivideByZeroException
if (denominator==0)
throw (2) ;
return(numerator / denominator);

public static void main(String args[])
int number1=0, number2=0, result0;
try
System.out.print1n("Enter the first number:");
number1 = Integer. valueOf(Keyboard.getString()).intValue();
System.out.print1n("Enter the second number:");
number2 = Integer. Va1ueOf(Keyboard.getString()).intValue();
result = quotient(number1,number2);

catch (NumberFormatException e)
System.out.print1n("Invalid integer entered!");
System. exit(-1);

catch ( (3) )
System.out.print1n(e.to String());
System.exit(-1);

Systcm.out.pfint1n(number1 + "/" + number2 + "=" + result);
其中, Keyboard类的声明为:
import java.io.*;
public class Keyboard
static BufferedReader inputStream = (4)
(new InputStreamReader(System.in));
public static int getInteger()
try(
return (Intoger.valueOf(inputStream.readLine().trim()).intValue());
catch (Exception e)
e.printStackTrace();
return 0;


public static String getString()
try
return (inputStream.readLine());
catch ( (5) )
return "0";