计算机病毒是一种
A.生物体
B.程序
C.细菌
D.化学物质
E.实用工具
参考答案:B
When did I begin my genealogy research().
A.After the death of my father.
B.After the death of my grandfather.
C.After the death of my mother.
D.After the death of my grandmother.
下面哪一项是对世界的看法()
A、哲学
B、宗教
C、文化
D、经济