计算机病毒是指()
A.编制有错误的计算机程序
B.设计不完善的计算机程序
C.已被破坏的计算机程序
D.以危害系统为目的的特殊计算机程序
参考答案:D
himself to supporting his brother’s son,he has to let one of his children leave school. [ ]
A.Having committed
B.Committed
C.Being committed
D.To commit
在生态系统中,数量最少的是
A.绿色植物
B.草食动物
C.小型肉食动物
D.大型肉食动物