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【单选题】
下面是一组关于Java类的描述,其中错误的是A.
所有Java程序都是由一个或多个类组成的
B.
Java只能有一个Public（公共）类
C.
Java只能有一个主类
D.
Java主程序不能是类，否则无法运行程序
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举一反三
【单选题】听力原文： Some of the notebooks George Washington kept as a young man are still in existence. They show that he was learning Latin, was very interested in the basics of good behavior. in society, and was ...
A.
lacked practice in public speaking
B.
felt his education was inadequate
C.
disliked arguing and debating with people
D.
felt the others were impractical
【单选题】From Paragraph 5 the author emphasizes ______.
A.
the danger of viruses
B.
the common existence of virus particles
C.
the short life span of viruses
D.
the difficulty in killing viruses
【单选题】From Paragraph 5 the author emphasizes ______.
A.
the danger of viruses
B.
the common existence of virus particles
C.
the short life span of viruses
D.
the difficulty in killing viruses
【判断题】以下程序的运行结果是4,2。#include void func(int a,int b);void main(){ int a=4,b=2; func(a,b);printf("%d,%d",a,b); }void func(int a,int b){ int t; t=a; a=b; b=t;}
A.
正确
B.
错误
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