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【简答题】
Language learning begins with listening. Children are greatlydifferent in the amount of listening they do before they start speaking, and later starters are often long listeners .Most children will “ obey ” spoken instructions some time before they can speak, though the word “ obey ” is hardly accurate as a description of the eager and delighted cooperation usually shown by the child .Before they can speak, many children will also ask questions by gesture and by making questioning noises. Any attempt to study the development from the noises babies ake to their first spoken words leads to considerable difficulties. It is agreed that they enjoy making noises, and that during the first few months one or two noises sort themselves as particularly expressive as delight, pain, friendliness, and so on. But since these can ’ t be said to show the baby ’ s intention to communicate ,they can hardly be regarded as early forms of language. It is agreed, too, that from about three months they play with sounds for enjoyment, and that by six months they are able to add new words to their store. This self-imitation (模仿) leads on to deliberate (有意的) imitation of sounds made or words spoken to them by other people. The problem then arises as to the point at which one can say that these imitations can be considered as speech. It is a problem we need to get out teeth into. The meaning of a word depends on what a particular person means by it in a particular situation and it is clear that what a child means by a word will change as he gains more experience of the world. Thus the use at seven months of “ mama ” as a greeting for his mother cannot be dismissed as a meaningless sound simply because he also uses it at other times for his father, his dog, or anything else he likes. Playful and meaningless imitation of what other people say continues after the child has begun to speak for himself, I doubt, however whether anything is gained when parents take advantage of this ability in an attempt to teach new sounds . 5.Before children start speaking________. A.they need equal amount of listening B.they need different amounts of listening C.they are all eager to cooperate with the adults by obeying spoken instructions D.they can ’ t understand and obey the adult ’ s oral instructions 6.Children who start speaking late ________. A.may have problems with their listening B.probably do not hear enough language spoken around them C.usually pay close attention to what they hear D.often take a long time in learning to listen properly 7.A baby ’ s first noises are ________. A.an expression of his moods and feelings B.an early form of language C.a sign that he means to tell you something D.an imitation of the speech of adults 8.The problem of deciding at what point a baby ’ s imitations can be considered as speech________. A.is important because words have different meanings for different people B.is not especially important because the changeover takes place gradually C.is one that should be properly understood because the meaning of words changes with age D.is one that should be completely ignored (忽略) because children ’ s use of words is often meaningless 9.The speaker implies________. A.parents can never hope to teach their children new sounds B.children no longer imitate people after they begin to speak C.children who are good at imitating learn new words more quickly D.even after they have learnt to speak, children still enjoy imitating
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举一反三
【单选题】下面关于分布式文件系统HDFS的描述正确的是:
A.
分布式文件系统HDFS是Google Bigtable的一种开源实现
B.
分布式文件系统HDFS比较适合存储大量零碎的小文件
C.
分布式文件系统HDFS是一种关系型数据库
D.
分布式文件系统HDFS是谷歌分布式文件系统GFS(Google File System)的一种开源实现
【单选题】下面关于分布式文件系统HDFS的描述正确的是:
A.
分布式文件系统HDFS比较适合存储大量零碎的小文件
B.
分布式文件系统HDFS是一种关系型数据库
C.
分布式文件系统HDFS是谷歌分布式文件系统GFS(Google File System)的一种开源实现
D.
分布式文件系统HDFS是Google Bigtable的一种开源实现
【单选题】下面关于分布式文件系统 HDFS 的描述正确的是:
A.
分布式文件系统 HDFS 是 Google Bigtable 的一种开源实现
B.
分布式文件系统 HDFS 是一种关系型数据库
C.
分布式文件系统 HDFS 比较适合存储大量零碎的小文件
D.
分布式文件系统 HDFS 是谷歌分布式文件系统 GFS ( Google File System )的一种开源实现
【判断题】超声探头发射超声波时,电能转换成声能,接收超声波时,声能转换成电能,因此探头又称换能器。
A.
正确
B.
错误
【判断题】超声波换能器又称超声波探头,在检测技术中所用到的超声波换能器主要采用压电式工作原理。
A.
正确
B.
错误
【单选题】下面关于分布式文件系统HDFS的描述正确的是:
A.
分布式文件系统HDFS比较适合存储大量零碎的小文件
B.
分布式文件系统HDFS是谷歌分布式文件系统GFS(Google File System)的一种开源实现
C.
分布式文件系统HDFS是一种关系型数据库
D.
分布式文件系统HDFS是Google Bigtable的一种开源实现
【简答题】变压器油的作用有___________、___________和___________。
【多选题】超声波换能器又称超声波探头,超声波换能器的工作原理有()
A.
压电式
B.
磁致伸缩式
C.
电磁式
D.
光电式
【简答题】触发器一旦定义,便保存在 中
【判断题】超声波传感器又称为超声波换能器或超声波探头。
A.
正确
B.
错误
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