材料一  地球上自从35亿年前出现生命以来，已有5亿种生物存在，如今绝大多数已经消失．地质年代物种灭绝的速度极为缓慢，鸟类平均300年灭绝1种，兽类平均8000年灭绝1种．到1600年至1700年，每10年灭绝1种动物；从1850年到1950年，鸟兽的平均灭绝速度为每年一种．

材料二  一项研究显示了哺乳类和鸟类濒危或受到威胁的原因如下表所示：

材料三  前我国各地采用的垃圾处理方法基本上都是掩埋法，生活垃圾在埋入土中后很快就被细菌等微生物降解，但如果我们用塑料袋把垃圾包起来，不仅延缓了垃圾消失时间，而且造成不可挽救的危害，这是“垃圾袋装化”的最大弊病．

划分南、北方区的分界线是（　　）

阅读理解

    A picture of a facial expression soon went hot on China' s social media platform during the 2016 Rio Olympics. Fu Yuanhui, a 1996-born girl ,became the second most popular word on the hot topic list because of her ecstatic(狂喜) reaction to her performance.

    In less than 24hours, Fu has been discussed thousands of times on Weibo, Wechat and other platforms. Her photos have been used as emoticons(符号表情) and in cartoons. Her fans went from 100,000 to over 2.7 million on her Weibo in just two days.

     “I did not reserve my strength. I have tried my best… I am very satisfied with the result and I have never thought about the final,” Fu said in her interview after the semi-final（半决赛）.

    Fu was quite humorous in the interview. She used a phrase called “Hong Huang Zhi Li” to describe the great efforts she had made in preparing for the match, which also became a popular word on the Internet.

     “Hong Huang Zhi Li” means “the strength which can separate the heaven from the earth in the chaotic(混沌的) world of ancient times”. While “Hong Huang” refers to “the chaotic state in the ancient times”, “Li” refers to “strength” in Chinese.