Junior school students in Harbin，Heilongjiang，had a long weekendThey had four days off fr

Junior school students in Harbin，Heilongjiang，had a long weekend．They had four days off from Oct．19-22．It was not for any festival，but was caused by serious smog．
The smog was caused by high levels of PM 2．5 in the air．
PM 2．5 is small particles（微粒） of pollution in the air with a diameter （直径） of 2．5 micrometers or less．Waste gas from cars and factories is the biggest cause of PM 2．5 pollution． On Oct．17，the World Health Organization named air pollution a cause of cancer．
To better protect children，cities are taking action．
On Oct．21，Harbin Education Bureau decided to close primary and junior high schools for two days．
Beijing started a program on Oct．22 which has a warning system with four levels．The red warning is the highest warning level．It means that the next three days will see serious pollution．
When a red warning is issued（发布），schools will close．
If there's pollution that's not as serious，the Beijing Commission of Education will ask schools to stop PE classes and outdoor activities．
How will students be informed?
First，the Commission of Education will inform schools online， Ye Yan，head of Beijing Shijingshanqu Experimental Primary School，told Beijing Times．Then teachers will text students’ parents．
Will the days off affect the study plan?
Missing school days will be made up during the summer or winter vacations， said Wang Hao，a physical education teacher in Beijing Chaoyang district．
For students in Harbin who had the long weekend，they would go to school on the next two Saturdays．
根据材料内容选出最佳选项，并在答题卡上将该项涂黑。
【小题1】Why did students in Harbin have a long weekend?A．Because the weather was extremely cold．B．Because a special festival came．C．Because the winter vacation began．D．Because there happened serious smog．【小题2】Which of the following is TRUE about PM 2．5?A．It makes water polluted．B．People can see it with eyes．C．It only comes from factories．D．It can cause serious diseases．【小题3】When a red warning is issued in Beijing，what will happen?A．All of the work will be stopped．B．People aren't allowed to go outside．C．Schools will be closed for a few days．D．Air pollution will be seen in a few weeks．【小题4】What does the underlined word text mean in Chinese?A．写信B．发信息C．写文章D．发邮件【小题5】What is the reading mainly about?A．What PM 2．5 is made up of．B．How people fight against air pollution．C．What influence the smog brings to school．D．How schools deal with the missing school days．D

(答案→)D 解析：试题分析: 本文讲述是某地的学生度过一个很长的周末，其实是受雾霾的影响，一旦发布红色预警，学校就应停课，及采样应采取的措施。【小题1】D 细节理解题。根据第一段提到It was not for any festival，but was caused by serious smog．不是因为节日而是由严重的雾导致的，故选D项。【小题2】D 细节理解题。根据第三段提到Waste gas from cars and factories is the biggest cause of PM 2．5 pollution． On Oct．17，the World Health Organization named air pollution a cause of cancer这种废气来自汽车，工厂，世界卫生组织宣布这种空气污染是致癌的原因，故选D项。【小题3】C 细节理解题。根据第第七段提到When a red warning is issued（发布），schools will close当红色预警时，学校应该关闭。故选C项。【小题4】B 细节推断题。根据第十段提到First，the Commission of Education will inform schools online， Ye Yan，head of Beijing Shijingshanqu Experimental Primary School，told Beijing Times．Then teachers will text students’ parents．首先教育部会网上通知学校，老师再通过短信通知学生家长，故选B项。【小题5】C 主旨大意。文中第一句话提到Junior school students in Harbin，Heilongjiang，had a long weekend初中的学生有了一个很长的假期，提到雾霾的影响，根据第四段提到To better protect children，cities are taking action为了更好的保护学生，各个城市应采取措施，故可知这是说雾霾对学校的影响，故选C项。

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