队列适用于下列哪一种应用______。
A．表达式求值
B．堆排序算法的实现
C．树的层次次序周游算法的实现
D．二叉树对称序周游算法的实现
2．对线性表进行二分法查找，其前提条件是______。
参考答案：C
解析： 本题考查点是队列的应用。选项A：表达式求值是栈的典型应用。选项B：堆排序算法的实现是数组的典型应用。选项C：树的层次次序周游算法的实现是队列的典型应用；选项D：二叉树对称序周游算法的实现是栈的典型应用。
| 用方框中所给的词组填空，每词只用一次。 | |
2. Are there _____ flowers in the picture? 3. I _____there are ten kites on the desk. 4. _____birds can you see in the sky? 5. Where is my_____dog? 6. _____the tree there is a boy. 7. There are _____photos on the wall. 8. The teachers are_____in the room. 9. There is _____one boy in the classroom. 10. There is a boat _____the river. |