问题 单项选择题 A1型题

患者男,15岁。因向急性根尖周炎进行根管治疗,在根管预备后,选择5%次氯酸钠、3%H2O2交替冲洗根管,选择该组冲洗液的原因如下,除了()

A.能溶解根管壁牙本质

B.能产生新生氧

C.有充分发泡作用能使根管内碎屑朝着牙冠方向排出

D.有很强的杀菌作用

E.对坏死组织有溶解作用

答案

参考答案:A

解析:次氯酸钠和过氧化氢的联合应用能去除根管内容物;溶解组织;产生新生氧从而破坏和杀灭病原微生物;润滑作用。因此B、C、D、E均可实现。但是它们不具备溶解根管壁牙本质的作用,这需要使用EDTA螯合剂来实现,因此A不能以次氯酸钠和过氧化氢的联合应用来实现,故此题选A。

单项选择题

Starting with his review of Skinner’s Verbal Behavior, Noam Chomsky had led the psycholinguists who argue that man has developed an innate (天生的) capacity for dealing with the linguistic universals common to all languages. Experience and learning then provide only information about the (1) instances of those universal aspects of language which are needed to communicate with other people within a particular language (2) .

This linguistic approach (3) the view that language is built upon learned associations between words. What is learned is not strings of words per se (本身), but (4) rules that enable a speaker to (5) an infinite variety of novel sentences. (6) single words are learned as concepts: they do not stand in a one-to-one (7) with the particular thing signified, but (8) all members of a general class.

This view of the innate aspect of language learning is at first not readily (9) into existing psychological frameworks and (10) a challenge that has stimulated much thought and new research directions. Chomsky argues that a precondition for language development is the existence of certain principles "intrinsic (原有的) to the mind" that provide invariant structures (11) perceiving, learning and thinking. Language (12) all of these processes; thus its study (13) our theories of knowledge in general.

Basic to this model of language is the notion that a child’s learning of language is a kind of theory (14) . It’s thought to be accomplished (15) explicit instruction, (16) of intelligence level, at an early age when he is not capable of other complex (17) or motor achievements, and with relatively little reliable data to go on. (18) , the child constructs a theory of an ideal language which has broad (19) power. Chomsky argues that all children could not develop the same basic theory (20) it not for the innate existence of properties of mental organization which limit the possible properties of languages.

19()

A.instinctive

B.addictive

C.tentative

D.predictive

单项选择题