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经典条件反射学说，下列说法正确的是：
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【填空题】Q: At the end of the video, the narrator mentioned four scientists. According to the video, what is the common feature they all share?A: Dispite their differences, they all shared the __________ courage to think outside the box, and the personal ___________ to stand ________ in the face of ___________.
小儿易发生意外伤害的时期是( )
3岁男孩,开始的时候出现频繁呛咳,后发生面部发绀,首先要考虑( )
小儿发病率及死亡率最高的年龄是( )
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