同等學(xué)力申請碩士學(xué)位英語考試全真模擬試題

內(nèi)容概要

本書由一線名師傾力打造，編者從事同等學(xué)力考試教學(xué)實(shí)踐多年，對同等學(xué)力考試有著許多獨(dú)到的見解，已成功培養(yǎng)出眾多高分考生。本書信息權(quán)威，講解深入淺出，針對考題類型提供科學(xué)高效的解題方法，可使考生迅速把握考試的精髓。

書籍目錄

Model Test One
答案解析
Model Test Two
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Model Test Three
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Model Test Four
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Model Test Five
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Model Test Six
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Model Test Seven
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Model Test Eight
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Model Test Nine
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Model Test Ten
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章節(jié)摘錄

版權(quán)頁：Caffeine, the stimulant in coffee, has been called the most widely used psychoac-tive substance on Earth. Synder, Daly and Bruns have recently proposed that caffeineaffects behavior by countering the activity in the human brain of a naturally occurringchemical called adenosine. Adenosine normally depresses neuron firing in many areas ofthe brain. It apparently does this by inhibiting the release of neurotransmitters,chemicals that carry nerve impulses from one neuron to the next. Like many otheragents that affect neuron firing, adenosine must first bind to specific receptors onneuronal membranes. There are at least two classes of these receptors, which havebeen designated Al and A2 Snyder et al propose that caffeine, which is structurallysimilar to adenosine, is able to bind to both types of receptors, which preventsadenosine from attaching there and allows the neurons to fire more readily than theyotherwise would.

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