单项选择题

Questions 31 to 34 are based on the passage you have just heard.

A．To move the muscles.
B．To carry different messages.
C．To protect the nerves.
D．To control nerve cells.

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将a point of crisis reached改为a point 0f crisis is reached。

单项选择题

Questions 31 to 34 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。