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    What would happen if you tried to blow a soap bubble in freezing weather? Would it freeze solid(固体) and fall to the ground? Would you have to hit it to break it? These questions happened to me on a cold winter day. It was too cold to play in the snow, but it was a perfect time to experiment with blowing frozen bubbles.
    To blow frozen bubbles, I used dishwashing soap and a drop of glycerin（甘油） to make it even better. I chose a place out of the wind, and blew bubbles the same way I always do. I watched to see what would happen. Here’s what I learned.
    If the temperature is low enough, the skin of the bubbles frosts over (结霜), becoming cloudy instead of clear. And what about those rainbow swirls（旋转） you see in soap bubbles? The rainbow colors stay even when the bubbles frost, but they don’t swirl anymore. The bubbles still stay in the air. They don’t fall to the ground any faster than they would on a warm summer day.
    When these frozen bubbles break, they don’t turn into small water drops as summer bubbles do. They turn into flashing rainbow confetti（碎屑） and move slowly to the ground. Sometimes a frozen bubble will roll across the snow without breaking. If nothing disturbs the bubble, it may stay there for a long time. Sometimes I could catch a bubble and hold it until the heat of my hand made it pop.
    I learned another thing about blowing frozen bubbles. It’s so interesting that I want to try it again next year.
    小题1:It is the perfect time to blow frozen bubbles on a ___________day.
    A．cold winterB．warm springC．hot summerD．sunny autumn
    小题2:When the frozen bubbles break, _________.
    A．they make a big soundB．they turn into small drops
    C．they fall to the ground like rain D．they become rainbow confetti
    小题3:The purpose of the passage is _______.
    A．to learn how to do a science experiment
    B．to show the experiment of blowing frozen bubbles
    C．to discover games that are fun to play in the snow
    D．to invent a new kind of soap that makes stronger bubbles

    小题1:A
    小题2:D
    小题3:B

    试题分析：这篇短文主要介绍了一个在冬季吹肥皂泡的实验,告诉我们在冬季吹肥皂泡会发生什么现象.
    小题1:根据第一段but it was a perfect time to experiment with blowing frozen bubbles.描述,可知选A.
    小题2:根据第四段When these frozen bubbles break, they don’t turn into small water drops as summer bubbles do. They turn into flashing rainbow confetti（碎屑）描述,可知选D.
    小题3:这篇短文主要介绍了一个在冬季吹肥皂泡的实验,告诉我们在冬季吹肥皂泡会发生什么现象,故选B.
    点评：本文浅显易懂，层次分明，学生很容易把握文章中心内容。答题中注意带着问题阅读短文，一般就能顺利找出答题依据。对于不能直接找到根据的问题注意联系上下文，根据短文中心总结出正确答案。
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