在下列物态变化过程中，属于放热的是

题干

在下列物态变化过程中，属于放热的是（　　）

A：出炉的钢水变成钢锭的过程

B：放入衣箱的樟脑丸逐渐变小消失的过程

C：冰不经过熔化就直接变为水蒸气的过程

D：打开暖水瓶盖，从瓶口冒出“白气”的过程

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A,D

This summer, Mary, Tom, Alan are going to have an ideal vacation .
The followings are their plans for the coming vacation .

	Mary	Tom	Alan
Where ?	The Great Wall	Spain	Canada
When?	The first week in June	The last day of the May	June, Monday 18^th
Who ?	His parents	His best friends	His cousin
What ?	Going hiking , Going sightseeing, Visiting some famous places in Beijing, Going shopping	Going sightseeing Going shopping Going camping Watching bull(牛)-fight	Spending time in the countryside , Renting videos at night , Going fishing , Going hiking, Sleeping a lot
How long?	About one month	Only two weeks	Until September
Transportation	By plane and by bus	By boat and by plane	By plane and by train