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GMAT阅读模拟试题考前练习19

2018-06-13 16:27:25来源:GMAT考试网分享
导读:这个月的GMAT考试就要开始了,考生们都准备好了吗!毕竟是要考商学院,题目还是很有难度的,大家可要好好复习哦!为了帮助大家更高效的复习,小编准备了一大波的阅读模拟题来分享给大家,快一起来看吧。

>>GMAT模拟题练习:GMAT阅读模拟试题考前练习19

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Scientific advances in the twentieth century have allowed researchers to study the chemical activities taking place in the sleeping human brain. In the 1970s, researcher Barry Jacobs drew on these advances to propose that a shared neurochemical basis in the neurotransmitters serotonin and norepinephrine accounts for the observable similarities between dreams and hallucinations. To test Jacobs’ theory, researchers attempted to elucidate the role of serotonin and norepinephrine in the normal sleep cycle and the effect of hallucinogenic drugs on these neurotransmitters.

Serotonin appears important for managing sleep, mood, and appetite, among other functions, while norepinephrine facilitates alertness and mental focus. Both neurotransmitters are discharged in high quantities only during waking states. At the onset of sleep, the neurons that release these neurotransmitters become less active, allowing the brain to enter the three non-rapid eye movement (non-REM) stages of sleep. The non-REM stages typically are not associated with normal dreaming, though parasomnias, such as sleepwalking and confusional arousals, are most common during stage 3. When the brain is ready to enter the fourth stage, REM, which is strongly associated with dreaming, the levels of these two chemicals drop virtually to zero. The Jacobs hypothesis held that the absence of norepinephrine was required to enable the brain to remain asleep, while the absence of serotonin was necessary to allow dreaming to occur.

Lysergic acid diethylamide, or LSD, is a semi-synthetic psychedelic drug which causes significant alteration of the senses; at doses higher than 20 micrograms, it can have a hallucinogenic effect. LSD mimics serotonin well enough to be able to bind at most of the neurotransmitter’s receptor sites, largely inhibiting normal transmission. In addition, the drug causes the Locus coeruleus, a cluster of neurons containing norepinephrine, to greatly accelerate activity. If the drug stimulates norepinephrine, thereby precluding sleep, and inhibits serotonin, creating a necessary condition for dreaming, then the resulting hallucinations could merely be “dreaming while awake.” The research thus far is promising but inconclusive; future scientific advances should allow this theory to be tested more rigorously.

1、Which best represents the author's attitude towards the presented theory?

A.It is ground-breaking in scope and impact.

B.It is likely to be proven true with further research.

C.It is not likely to survive a concerted effort to disprove it.

D.It has not yet been sufficiently developed.

E.It has potential but is not conclusive.

正确答案:E

GMAT阅读题目解析

根据题意,选答案E。

上面的阅读试题大家都做完了吗,可不要白做,要更多的思考是为什么哦!想要找更多的GMAT模拟题就来坦途网GMAT考试频道吧,小编在这里为你加油啦!

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