题目

How often do you change your hairstyle or ask for new dresses? You may be   26   to follow trends（潮流）in Western countries, but young people in the United States don’t care as much about   27   as you do.     A recent survey among high school   28   in China, Japan, South Korea and the US found that   29   teenagers care more about their appearance than young people in the US.     This survey was held in 156 high schools in the four countries. More than 7,000 teenagers were   30   about their views on life and the world. South Koreans, at 83 percent, (10分) 环境保护  阅读图文资料，完成下列要求。                           2013年1月30，新一轮的严重污染继续肆虐京城，PM2.5、PM10、二氧化氮同时超标。北京呈现严重的灰霾与空气污染天气。上图示意北京市PM2.5来源百分比。 列举灰霾天气形成的大气条件，并指出北京市PM2．5的市区内污染源。