计算（-2）2-3的值是[ ]
A.1
B.2
C.-1
D.-2
答案：A
This is _____ African camel. That is _____ European wolf.[ ]
A. a; a
B. an; an
C. a; an
D. an; a
确定列表框内的某个条目是否被选定应使用的属性是
A．Value
B．ColumnCount
C．ListCount
D．Selected
