2016年春节前我国大部分地区遭到强寒潮袭击，如图所示，短时间内寒潮致使我国大部分地区出现冰雪、霜冻现象，下列相关说法正确的是

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2016年春节前我国大部分地区遭到强寒潮袭击，如图所示，短时间内寒潮致使我国大部分地区出现冰雪、霜冻现象，下列相关说法正确的是（　　）

A：冰冻的形成是凝华现象

B：霜的形成是凝固现象

C：室外的人嘴里呼出的“白气”是水蒸气

D：冰冻和霜的形成都是放热过程

上一题下一题 0.0难度选择题更新时间:2019-03-26 10:10:14

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D

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阅读下列短文，从每题所给的四个选项（A、B、C、D）中选出最佳选项。

A

Come and see the Indian elephants and the new tigers from America. The monkeys are waiting to meet you, and the pandas from China are waiting to take pictures with you. The lovely koalas from Australia are waiting to laugh at you, and the giraffes from Africa are waiting to look down on you. The parrots want to speak to you!

TICKETS

Grown-up: $4.00 Children: Over 12 $ 2.00; Under12 $ 1.00

Opening time: 8.00 a.m.- 4.00 p.m.

Except Friday: 10.00 a.m.- 3.00 p.m.

Keep the zoo clean!

Do not touch, give food or go near animals.

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