化学变化的本质特征是有新物质生成，化学变化中的一些现象有助于我们判断物质是否发生了化学变化，

巴黎气候大会达成了《巴黎协定》，最大限度地凝聚了各方共识，向着《联合国气候变化框架公约》所设定的“将大气中温室气体的浓度稳定在防止气候系统受到危险的人为干扰的水平上”的最终目标迈进了一大步．

Show me green.  正确的译文是：

课文填空

    The skin is ____ essential part of your body and its ____ organ. You have three ____ of skin which act as a barrier ____ disease, poisons and the sun's harmful rays. The ____ of your skin are also very ____: it keeps you warm or cool; it prevents your body from ____ too much water; it is where you feel cold, heat or pain it gives you your sense of ____. So you can imagine, if your skin gets ____ it can be very serious. First aid is a very important first step in the ____ of burns.