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【简答题】
One day newly wedded Nancy lost her ring while helping to plant potatoes. Friends were called and the field was searched long but in vain(徒劳). Later, when the potatoes were harvested, Everyone looked out for the ring but it remained lost. Another year came round and all the farmers working in the field kept their eyes open. The following year was the same. And year after year, whoever had business in the field always had Nancy’s ring in his mind. Then the farm changed hands but it went no farther than to cousins. So the memory of the lost ring remained alive until thirty-eight years had passed. Then came a spring day when a man was ploughing the field behind a pair of horses. Even after thirty-eight years he still looked out for the ring, a nd knew just which part of the field Nancy had lost it in. At this time, when he came there, he found it .He picked it up, put it carefully into his pocket, left his horse, and ran all the way down to the village and placed it into Nancy’s hand. 小题1: How did Nancy come to lose her ring? A.She lost it while helping to harvest tomatoes in the field B.She lost it while watering the plants in the field. C.She lost it while working in the field. D.She lost it while helping to plant potatoes in the field. 小题2: Why did people keep looking for the ring even after the farm changed hands? A.It was a very expensive ring B.They all wanted to solve the mystery. C.They all loved Nancy. D.Everybody wanted to have this ring. 小题3: What did the ploughman do after finding the ring? A.He picked it up and put it in his pocket. B.He ran back to tell everybody in the village. C.He placed it in a secret spot. D.He returned it to the owner. 小题4:. What can you infer from the story? A.The ring was invaluable. B.People on the farm were honest and helpful. C.The ring’s disappearance was the work of supernatural power. D.Nancy no longer expected that her ring would be found again.
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举一反三
【简答题】如果条件允许,多段抽样中应尽可能扩大哪一级样本的规模?为什么?
【单选题】【 6-1-9 】 如果二叉树 T 2 是由一棵树 T 1 转换而来的二叉树,那么 T 1 中结点的先根序列对应 T 2 的( )序列。 A. 先序遍历 B. 中序遍历 C. 后序遍历 D. 层次遍历
A.
本题答案为 A 。
B.
错误
C.
不正确
D.
概念错误
【单选题】【Test-6-1-4】如果二叉树T2是由一棵树T1转换而来的二叉树,那么T1中结点的先根序列对应T2的( )序列。
A.
先序遍历
B.
中序遍历
C.
后序遍历
D.
层次遍历
【单选题】【Test-6-1-5】如果二叉树T2是由一棵树T1转换而来的二叉树,那么T1中结点的后根序列对应T2的( )序列。
A.
先序遍历
B.
中序遍历
C.
后序遍历
D.
层次遍历
【单选题】如果一棵二叉树T2是由一棵树T1转换而来的,那么T1中的节点的先根序列对应T2的( )
A.
先根序列
B.
中根序列
C.
层次序列
D.
后根序列
【单选题】下列选项中,关于建筑石膏的特点,说法不正确的是(    )。
A.
吸水性强,耐水性差
B.
凝结硬化速度快
C.
防火性能差
D.
容易着色
【单选题】下列选项中,关于建筑石膏的特点,说法不正确的是(    )。
A.
吸水性强,耐水性差
B.
凝结硬化速度快
C.
防火性能差
D.
可装饰性
【单选题】关于建筑石膏的特点,下列说法正确的是()。
A.
凝结硬化快
B.
防水性能好
C.
防火性能差
D.
强度高
【单选题】如果二叉树 T2 是由一棵树 T1 转换而来的二叉树,那么 T1 中节点的先根序列对应 T2 的 序列。
A.
先序遍历
B.
中序遍历
C.
后序遍历
D.
层次遍历 (5.0分)
【单选题】【 6-1-10 】 如果二叉树 T 2 是由一棵树 T 1 转换而来的二叉树,那么 T 1 中结点的后根序列对应 T 2 的( )序列。 A. 先序遍历 B. 中序遍历 C. 后序遍历 D. 层次遍历
A.
错误
B.
本题答案为 B 。
C.
不正确
D.
概念错误
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