下列厨房里发生的变化中，属于化学变化的是（  ）

θ∈R，则方程x²+$\frac{y^2}{\sin \theta }$=4表示的曲线不可能是（　　）

    China Daily Sept 6, 2016

    Two days ago China held the G20 Leaders Summit (峰会) in Hangzhou. Leaders of the G20 members not only talked about the world issues, but also had a taste of Chinese culture.

    The logo of the summit shows Chinese architectural (建筑) culture. The logo looks like a bridge. “I got the idea from the old arched bridges (拱桥) at the West Lake,” said the designer Yuan Youmin. “Bridge link (连接) people and places in many different ways, just as the G20 brings east and west together.”

CCTV News Apr 20, 2017

    China has taken another step toward its goal of putting a space station into orbit around 2022, by sending its first cargo (货物) spacecraft Tianzhou-1 into space on Thursday evening.

    Atop a Long March-7 Y2 carrier rocket, Tianzhou-1 rose into the air from the Wenchang Space Launch Center in south China's Hainan Province at 7:41 p.m. After about 596 seconds, the spacecraft and rocket successfully separated into orbit.

欣赏下列反映第二次世界大战历史的漫画:
 
           漫画一 《          》                                           漫画二 《胜利》
回答问题:
（1）从漫画一中能获取什么历史信息？请为漫画一命名。
（2）列举漫画二中“烟斗”在第二次世界大战中的主要贡献两例。
（3）“雪茄+长烟嘴+烟斗”与“V”的寓意各指什么？
（4）二战中决定建立联合国的会议是什么？
（5）漫画一与漫画二中的最后结局给我们什么启示？