如果2(x+3)的值与3(1-x)的值互为相反数，那么x等于(   )

—《求婚尺牍》吸引了从多网友眼球“一不尚貌美，但需端正

清白；二需先经几度口头谈话，半年或一年，以朋友资格相处，

然后方可订婚；三有知识而无旧式闺秀恶习，且非自命不凡，

专尚新时者；态度温和，身体健康；四月牺牲及服务社会之精

神。”这反映了当时（    ）

已知椭圆$\frac{x^2}{a^2}+\frac{y^2}{b^2}=1\left(a>b>0\right)$的左、右焦点分别为$F_1\left(-c,0\right),F_2\left(c,0\right)$，若椭圆上存在点P使$\frac{a}{\sin \angle P{F}_1{F}_2}=\frac{c}{\sin \angle P{F}_2{F}_1}$，则该椭圆的离心率的取值范围为（   ）

情景1：如图是教义市蓸西河滑雪声人工造雪的场景，工人将水注入一个专用喷嘴和喷枪，在那里接触到高压空气，高压空气将水流分割成微小水滴并喷入寒冷的外部空气中，在落到地面以前这些小水滴变成冰晶，也就是人们看到的雪花．

情景2，今冬，我省降雪较少，多地为了缓解旱情，在温度较低的天气利用直升机向空气中喷洒干冰，进行了人工降雪．

请解释；

（1）人工造雪和人工降雪中雪的形成分别属于哪种物态变化？

（2）请用学过的物理知识解释人工降雪时雪的形成原因．

A：Jane，I called you just now, but you didn't pick up．____?

B：I was reading a story called the fox and the crow(《狐狸和乌鸦》)．

A：____?

B：Oh ,it's very educational．

A：____?

B：Of course．One day, the crow got a piece of meat．The fox was very hungry and wanted to eat the meat．Then the fox said hello to the crow．But the crow didn't answer．

A：____ ?

B：Then the fox said the crow had a beautiful voice and asked the crow to sing a song．The crow was very proud(得意的)and wanted to sing．When it opened its mouth，the meat dropped and the fox got it．

A：The crow was really silly．

B：____．The fox wasn't telling the truth．The crow had a terrible singing voice．