填空题

Memory is chemical as well as electrical in nature.

【参考答案】

Y

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填空题

An important discovery recently made in memory research is that remembering is closely related to electrical activity inside the brain.

问答题

能源是当今人们最关心的重大问题之一。 2. 节约使用是缓解能源短缺的手段之一。 3. 但最好的解决办法是开发新的能源。