【单选题】【消耗次数：1】
副交感神经兴奋时
①
瞳孔开大
②
心跳加强，血压下降
③
支气管平滑肌收缩
④
胃肠蠕动减弱
⑤
血管收缩
参考答案：
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【单选题】
由于幼儿的肌肉中水分多，蛋白质及糖原少，不适合他们的运动项目是( )。
①
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②
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③
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④
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