You will hear a recording. Type the missing words in each blank.
你将听到一段录音。请在每个空格里打出缺失的单词。
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In animals, a movement is coordinated by a of neurons in the spinal cord called the central contract generator (CPG). This produces signals that drive muscles to contract rhythmically in a way that produces running or walking, depending on the of pulses. A simple signal from the brain instructs the CPG to switch between such as going from a standstill to walking.
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