Question

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11、在C#语言中，if语句中的判断表达式（ ）
A.必须是逻辑表达式可以 B.是任意有效表达式
C．必须是逻辑或关系表达式
D. 必须是关系表达式
12、字符串数组strarray包含以下元素：
string[] strarray={“this”, “is”, “a”, “test”};
则以下语句在控制台的输出是什么?（ ）
string strafterjoin =string.Join(“, ”,strarray);
Console.WriteLine(strafterjoin);
A．”this”,”is”,”a”,”test” B．this is a test
C．this,is,a,test D．thisisatest
13、以下关于C#代码的说法正确的是（ ）
public abstract class Animal
{
public abstract void Eat();
public void Sleep(){ }
}
A．代码编译错误，因为类中方法没有实现
B．代码编译错误，因为类中存在非抽象方法
C．该段代码正确
D．通过代码”Animal an = new Animal();”可以创建一个Animal对象
14、在C#中，关于继承和接口，以下说法正确的是（ ）
A．C#允许多接口实现，也允许多重继承
B．C#允许多接口实现，但不允许多重继承
C．C#不允许多接口实现，但允许多重继承
D．C#不允许多接口实现，也不允许多重继承
15、在.NET中，程序中的错误可以划分为以下除了（ ）的三类。
A.逻辑错误
B.运行时错误
C.语法错误
D.自定义错误
16、在C#中，（ ）正确定义了一个数组。
A．int iArray = new int[10];
B．int[] iArray = new int;
C．int[] iArray = new int(10);
D．int[] iArray = new int[10];
17、以下选项中,哪一个变量名的定义是错误的（ ）
A.Abc
B.my_vala
C._myValue
D.class
18、在面向对象技术中，类是由( )组成的
A．数据
B.方法
C.属性
D.以上全是
19、在面向对象技术中，接口主要是用来实现( )的技术
A. 继承
B.封装
C.多态
D.以上都是
20、用来定义事件的关键字是（ ）
A. event
B. delegate
C. interface
D.以上都不是
21. 在C#中，下列代码的运行结果是（ ）
int []num = new int[] {1,2,3,4,5};
ArrayList arr = new ArrayList();
for(int i=0;i<num.Length;i++)
{
arr.Add(num[i]);
}
arr.Remove(arr[2]);
Console.Write(arr[2]);
A．1
B．2
C．3
D．4

Answer 1

Joi Chua or Joi Tsai ( born August 3, 1978) is a Singaporean female singer signed under Play Music.
Joi was educated at Raffles Girls' Primary School, Clementi Town Secondary School, and Singapore Polytechnic in Optometry.
She debuted in 1996 in Extraordinary Singers Course organized by Ocean Butterflies Production Company, switching to Play Music in 2004.
Joi picked up the merit award under the cultural achievement category of The Outstanding Young Person Award for 2006.
In addition to being a singing superstar, she was the ambassador for the Singapore Speak Mandarin Campaign 2005 and was involved in concerts over 12 different primary and secondary schools to promote the campaign. She had been commissioned by MediaCorp to sing the Channel 8 NKF Drama Series theme song and the ending theme song. She was the ambassador for Singapore Tourism Board’s theme song ‘Uniquely you’ Chinese version and has the accompanying music video that is used by STB to promote Singapore to both locals and foreigners.
Joi has performed for the National Day parade 2005 & 2008 and also to sold-out large scale music Craze Concert in 2005.
Her name is synonym of talent in the singing industry and she is continuously building her singing career and has been accepted and recognized as one of the young talented youth of Singapore. She also contributes to the community service through her work with children promoting the mandarin language.
Joi was the best selling local female singer of the year in 2005 as well as having one of her album in the number four overall best selling album of the year in 2005.