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】
做这类阅读判断正误题，需先通读原文，再针对每个小题的表述，定位原文对应内容，对比题干与原文的细节是否一致，从而判断对错；回答问题时，需从原文中找到支撑结论的依据，组织语言作答。
【解析】
1. 定位原文第一句：“When the weather gets very cold, the water in the clouds meets the cold air...It is snow.”，题干中是“warm air（暖空气）”，与原文“cold air（冷空气）”不符，故错误，选B；
2. 定位原文：“The snowflakes look so small...But they have different shapes.”，与题干表述一致，故正确，选A；
3. 定位原文：“There are about 35 different types of snowflakes in the world.”，题干说“only two types（仅两种）”，与原文不符，故错误，选B；
4. 定位原文：“When the temperature is down to -5℃ or even lower, the snowflakes will become flat like a plate.”，-10℃属于低于-5℃的情况，雪花形状为扁平状，题干表述正确，选A；
5. 原文提到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】
阅读理解、细节理解
【点评】
本题为说明文阅读的判断正误类题目，侧重考查对原文细节信息的精准定位与辨析，需学生仔细比对题干与原文的表述，避免概念混淆，整体难度适中。
【难度系数】
0.5