Hopefully, another ten volunteers ______ to work in the new exhibition by the end of this week.

A．will be selected

B．are selected

C．have been selected

D．will have been selected

下列叙述中正确的是( )。

A．入栈运算只须将新元素插到栈顶指针指向的位置

B．出栈运算只须将栈顶元素赋给一个指定变量

C．出栈运算与读栈顶元素是相同的操作

D．读栈顶元素不删除栈顶元素