我们依据反应事实，通过比较、推理等方法可以总结归纳出灭火的规律并加以应用，请回答下列问题：图A．所示的“火三角”可表示燃烧的条件，图中缺少的一个条件是____ ；图B所示的灭火原理是：____ ；点燃篝火时，常将木柴架空以促进燃烧，是利用了增大____ 的方法．

不论在这个国家的街头还是海滩，到处都可以看到各种肤色的青年和孩子在踢足球，这个国家的足球运动水平堪称世界一流。这个国家是：

阅读理解，判断正误。

Four Seasons

    Spring is the best season of the year. It lasts from March to May. The days get longer. The nights get shorter, and the weather gets warmer. Everything begins to grow. Grass and trees begin to turn green. Flowers begin to come out. Children begin to fly kites outdoors.

    Summer comes after spring.  It is the hottest season in the year. It lasts from June to August. People try to find a cool place then. They always go swimming in pools, lakes, and rivers.

    Autumn is the harvest season. It gets cool. Farmers begin to reap (收割).They are busy from September to November.

    The coldest season of the year is winter. It's from December to February. The days are short and the nights are long. It snows sometimes and that makes the children happy. They make a snowman and dance around it. They go ice-skating as well.

关于物态变化的探究．

如图是一物质发生物态变化时，温度与时间的变化曲线．