4. 某婴儿生活较有规律,愉快情绪多,情绪反应适中,对新异刺激一般反应积极,较易适应环境。按托马斯、切斯等的气质分类理论,该婴儿的气质属于( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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