对象是软件系统中用来描述客观事物的一个实体，它是构成系统的【 】。

A．SELECT S#，SNAME FROM S WHERE SNAME = ′刘％′
B．SELECT S#，S NAME FROM S WHERE SNAME = ′刘_′
C．SELECT S#，SNAME FROM S WHERE SNAME LIKE ′刘％′
D．SELECT S#，SNAME FROM S WHERE SNAME LIKE ′刘_′