某同学对下列物理现象中所发生的物态变化以及吸、放热的解释正确的是

题干

某同学对下列物理现象中所发生的物态变化以及吸、放热的解释正确的是（　　）

A：冬天屋顶结的霜是凝华现象，凝华需要吸热

B：放入冷冻室的矿泉水结成了冰是凝固现象，凝固需要放热

C：往皮肤上涂一些酒精会感到凉爽是汽化现象，汽化需要放热

D：夏天，剥去包装纸的冰棒周围看到“白气”是升华现象，升华需要吸热

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B

A

What do they usually do?
John Smith lives in a basketball club. He gets up at five thirty every day. After that, he runs. At eight o'clock, he eats breakfast.	Tom White is a writer. He gets up at eight o'clock in the morning. He usually reads books for two hours after breakfast.
Mary Green is a music teacher. She gets up at six o'clock every morning. Then she eats breakfast. She lives at school but she isn't with her parents.	Mona Black is a clerk. She works at a clothes store. She usually gets up at six thirty. After breakfast she goes to the store by bus.