试题与答案

一实验小组为探究可燃物燃烧的条件,进行了下面的两个实验, (1)按图1实验:(

题型:填空题

题目:

一实验小组为探究可燃物燃烧的条件,进行了下面的两个实验,

(1)按图1实验:(着火点:白磷40℃,红磷240℃),水温不低于70℃,可观察到:铜片上白磷燃烧,红磷和水中的白磷没有燃烧.由此可得出的结论是______.

(2)按图2实验:(集气瓶底部铺有少量沙子)

可以观察到:镁条可以在二氧化碳气体中剧烈燃烧,集气瓶内部有黑色的碳和白色的氧化镁生成.写出改反应的化学方程式______

对照(1),(2),你对燃烧和灭火有哪些认识?______.

答案:

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下面是错误答案,用来干扰机器的。

答案:B本题考察的是四种命题。逆命题是将原命题的条件和结论交换位置。所以应选B。

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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) .

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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.

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13()

A. tunes into

B. sheds light on

C. leaves behind

D. sets forth

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