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【简答题】
完形填空(共12分,每小题1分) 阅读下面的短文,掌握其大意,然后从短文后各题所给的A、B、C、D四个选项中,选择最佳选项。 As sixth graders, kids were separating into groups, but I wasn't sure where I belonged. Our teacher gave us a task called 'secret friends' for the coming week.We were supposed to do nice things our friends without letting them know who was doing it.We could leave encouraging notes or cards either on their desks or in their bags.Before doing the task, with our eyes closed, from a basket, we a name of a classmate who we were to secretly befriend over the next five days. Soon, the task was turned into a competition of giving instead of notes.Everyone was getting cool presents except me.My friend exactly what the teacher had told us.So I received nothing but hand-made cards with nice words about me. On the last morning, I finally got a package.When I it, the girls around all .It was an 'old lady' gift.My face went red. I tried to forget about the shaming gift, but when the same girls it again during the break in the bathroom, I joined in, 'How stupid! My grandmother wouldn't want it.' The girls laughed at my words and went out of the bathroom.Washing my hands, I let the water run through my fingers I thought about my words.It wasn't like me to say things like that. 'I'm your secret friend.' It was Rochelle.' I' m sorry about the gift,' she said to me, tears running down her face. From a poor family, she was a target(目标) at school for those with rich parents.Yet she just took all the terrible treatment silently. I was sick to my stomach as my words ran through my mind.She had heard everything.How could I have been so unkind? Later I learned she had felt bad all week about not being able to leave me any cool present and her mum had given up her only luxury(奢侈品). And I had destroyed everything for her. I told her that I had only said those things to try to fit in. 'We aren't that different from each other, are we?' She smiled understandingly.Her simple , spoken from her heart, found their way straight into mine. 小题1: A.for B.behind C.through D.like 小题2: A.drew B.changed C.found D.picked 小题3: A.chances B.help C.hope D.gifts 小题4: A.learned B.copied C.followed D.understood 小题5: A.discovered B.opened C.caught D.held 小题6: A.cheered B.shouted C.laughed D.clapped 小题7: A.mentioned B.saw C.showed D.suggested 小题8: A.just B.ever C.even D.only 小题9: A.if B.as C.since D.because 小题10: A.exactly B.perfectly C.normally D.necessarily 小题11: A.powerful B.hurtful C.useful D.helpful 小题12: A.cards B.actions C.choices D.words
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举一反三
【单选题】回溯算法是不是确定的算法
A.
B.
不是
C.
有时候是有时候不是
D.
看问题
【简答题】合并排序算法是利用( )实现的算法。 (A)分治策略 (B)动态规划法 (C)贪心法 (D)回溯法
【单选题】在含有下列物种的溶液中分别加入Na2S溶液,发生特征反应用于离子鉴定的是
A.
[Cu(N H 3 ) 4 ] 2+
B.
Hg 2+
C.
Hg 2 2+
D.
Cd 2+
【简答题】见过的回溯法的算法有:迷宫问题,还有______和______等。
【多选题】下列情况下调查单位和填报单位不一致的是( )。
A.
工业企业生产设备调查
B.
工业企业现状调查
C.
农产量调查
D.
城市零售商店销售情况调查
【简答题】矩阵连乘问题的算法可由( )设计实现。 (A)分支界限算法 (B)动态规划算法 (C)贪心算法 (D)回溯算法
【简答题】见过的回溯法的算法有:迷宫问题,还有________和________等。
【单选题】下列对回溯算法的描述中,哪个描述是错误的?
A.
回溯算法就是递归算法
B.
回溯算法可以使用递归来实现,主要思想是对递归的分支进行了裁减。
C.
回溯算法比常规的递归算法性能更优
D.
回溯算法实际上一个类似枚举的搜索尝试过程,主要是在搜索尝试过程中寻找问题的解,当发现已不满足求解条件时,就“回溯”返回,尝试别的路径。
【单选题】图搜索策略最大的优点是_。
A.
当回溯出现时,回溯点处进行的搜索将被算法'忘记',其好处是节省了存储空间。
B.
被回溯掉的已经搜索过的部分,不能被以后使用。
C.
搜索过的路径除了可以重复利用。
D.
可以更有效地利用与问题有关的一些知识,从而达到启发式搜索的目的。
【多选题】下列情况下调查单位和填报单位不一致的是( )。
A.
工业企业生产设备调查
B.
人口普查
C.
工业企业现状调查
D.
农产量调查
E.
城市零售商店销售情况调查
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