2. 外语
  3. The key to pleasant music may be that it pleases our neurons. A new model suggests that【C1】______musical intervals trigger a rhy

The key to pleasant music may be that it pleases our neurons. A new model suggests that【C1】______musical intervals trigger a rhy

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问题     The key to pleasant music may be that it pleases our neurons. A new model suggests that【C1】______musical intervals trigger a rhythmically【C2】______ firing pattern in certain auditory neurons, and that sweet sounds carry more information than【C3】______ones.
    【C4】______ the time of the ancient Greeks, we have known that two tones whose【C5】______ were related by a simple ratio like 2:1 or 3: 2 produce the most pleasing, or consonant, musical intervals. This effect doesn’t depend on musical【C6】______—infants and even monkeys can hear the difference. But it was unclear whether consonant chords are easier on the ears【C7】______the way the sound waves combine in the air, or the way our brains【C8】______ them to electrical impulses. A new mathematical model presents a strong【C9】______for the brain.
    "We have found that the reason for this difference is【C10】______at the level of neurons," says Yuriy Ushakov at the N. I. Lobachevsky State University of Nizhniy Novgorod in Russia. Ushakov and colleagues considered a simple mathematical model of the way sound 【C11】______from the ear to the brain. In their model, two sensory neurons 【C12】______ to different tones. Each sends an electrical signal to a third neuron, called an interneuron, which sends a final signal to the brain. The model’s interneuron fires【C13】______ it receives input from【C14】______ or both sensory neurons.【C15】______, the signals from the sensory neurons arrive at the same time if the tone is consonant, and so the interneuron still fires just once, then waits until it "【C16】______" before it fires again. The result is a(n) 【C17】______train of pulses.
    【C18】______, the signals from harsh tones arrive at【C19】______times and so generate an【C20】______ spaced train of pulses in the interneuron.
【C13】
选项 A、when
B、if
C、before
D、since
答案A
解析 逻辑关系题。句意为：这一模式的中间神经元在接收到来自其中一个或两个感觉神经元的信号时发挥作用。根据上下文语境，此处应该是时间状语。[A]when“当……”，引导时间状语从句，故为答案。[B]if引导条件状语；[C]before和[D]since虽然可以引导时间状语从句，但分别表示“在……之前”和“自从”，均不符合语境，故排除。
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