在深度为5的满二叉树中，叶子结点的个数为

A．operator/(x.operator--(),y)；
B．operator/(operator--(x),y)；
C．operator--().operator/(y);
D．operator/(operator--(x));

A．表达式 Wednesday == Friday 的值是 true
B．Day day; day=3;
C．Day day; day = Monday + 3;
D．Day day; day = Tuesday + 10;