B
（体裁:说明文 话题:雪花的形态密码 难易度:☆☆☆☆）
When the weather gets very cold, the water in the clouds meets the cold air, and they will become little ice crystals(小冰晶). It is snow. When the snow joins together, it will become snowflakes(雪花). The snowflakes look so small. Look carefully, and you will see the six “arms” of them. But they have different shapes. Different air temperatures(气温) make different shapes of snowflakes. When the temperature is about $-2°\mathrm{C}$, the snowflakes look like needles. They have long and thin “arms”. They will look like this . When the temperature is down to $-5°\mathrm{C}$ or even lower, the snowflakes will become flat(扁平) like a plate. Here is a picture “”. Do you know? There are about 35 different types of snowflakes in the world. How cool!
阅读短文,判断下面的句子是否正确,正确的写“A”,错误的写“B”,并回答问题。
() 1. When the water in the clouds meets the warm air, it will become snow.
() 2. Snowflakes look very small and they have different shapes.
() 3. There are only two types of snowflakes in the world.
() 4. When the temperature is $-10°\mathrm{C}$, the snowflake looks like this “”.
5. Does the snowflake change?

1.B
2.A
3.B
4.A
5. Yes, it does.

【分析】这是一篇关于雪花形态的英语说明文阅读理解题，解题思路为：先通读短文，把握核心内容（雪花形成及形态与气温的关系）；针对判断正误题，需回到原文定位对应关键语句，将题目描述与原文信息逐一比对，判断是否一致；针对回答问题，提取原文相关信息组织答案。
【解析】1. 原文第一句明确指出“当天气很冷时，云中的水遇到冷空气会变成小冰晶，这就是雪”，题目中说遇到暖空气，与原文不符，故判断为错误，选B。
2. 原文提到“雪花看起来很小，且有不同的形状”，题目描述与原文一致，故判断为正确，选A。
3. 原文说明“世界上大约有35种不同类型的雪花”，题目说只有两种，与原文不符，故判断为错误，选B。
4. 原文提到“当温度降到-5℃或更低时，雪花会扁平如盘”，结合题目语境，对应描述正确，故判断为正确，选A。
5. 原文指出不同气温会形成不同形状的雪花，说明雪花会变化，故回答Yes, it does.
【答案】1.B 2.A 3.B 4.A 5. Yes, it does.
【知识点】英语阅读理解、细节理解判断、信息提取回答
【点评】本题为说明文类阅读理解，侧重考查学生对文章细节信息的定位与判断能力，题型基础，适合巩固英语阅读解题技巧。
【难度系数】0.7