欢欢和乐乐正在一起用积木搭高楼，眼看着就要成功了，安安推着小车撞向了搭建好的高楼，欢欢和乐乐立马大哭起来，老师听到后赶紧前来了解情况，并教育了安安。请问老师此时介入的时机是( )。
【单选题】
结构类型为甾体的化合物是（）。
A.
斑蝥
B.
胆酸
C.
麝香酮
D.
水蛭素
E.
牛磺酸
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参考解析
【单选题】
泄泻湿热内蕴证的临床症状是（）
泻下粪便臭如败卵，伴未消化食物，嗳腐吞酸
泻下急迫，泻下不爽，肛门灼热，小便短黄
大便时溏时泻，稍进油腻食物，便次明显增多
黎明之时，脐腹作痛，肠鸣即泻，泻后则安
泄泻清稀，甚则如水样，腹痛肠鸣，脘闷食少
【单选题】
新题型
Zoos which spare no effort to take care of animals should not be subjected to unfair criticism.
To pressure zoos to spend less on their animals would lead to inhumane outcomes for the precious creatures in their care.
While animals in captivity deserve sympathy, zoos play a significant role in starting young people down the path of related sciences.
Zoos save people trips to wilderness areas and thus contribute to wildlife conservation.
For wild animals that cannot be returned to their natural habitats, zoos offer the best alternative.
Zoos should have been closed down as they prioritize money making over animals' wellbeing.
Marris distorts our findings which actually prove that zoos serve as an indispensable link between man and nature.
【单选题】
迄今为止资本主义社会的发展，大体可分为（ ）。
自由竞争资本主义和垄断资本主义两个阶段
垄断资本主义和非垄断资本主义两个阶段
商品经济和市场经济两个阶段
国内垄断和国际垄断两个阶段
