某学校课外兴趣小组同学在饲养金鱼时，发现金鱼不时浮上水面直接呼吸，即发生浮头现象．为探究金鱼发生浮头现象的可能原因，该小组将15条大小相当的金鱼，按表给定的条件进行了相关实验．

It's _________ the science museum.

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    Which Skirt to Wear?

    Tina is 8 years old, and follows her own ideas. When her parents tell her to do something, she always doesn't do it. Today, she will go to a friend's birthday party. She is now choosing skirt to wear. She has three skirts: a blue skirt, a white one and a yellow one. She asks her father, “Which one is the best?” her father says, “I think the blue one is the best.” Then she asks her mother, “Which one do you think is the best?” Her mother answers, “The white one, of course!” Tina says, “Thank you.” Then she puts on the yellow skirt and goes out.

东方卫视《壹周立波秀》栏目在2011年隆重推出“七·一”特别节目《国家大事》，以其特有的形式纪念中共成立90周年。其中的背景标语就是一部浓缩的中共党史。下列标语按时间先后排列正确的是①一切反动派都是纸老虎 ②星星之火，可以燎原③打倒列强，除军阀 ④抗美援朝，保家卫国