Beijing Environmental Protection Bureau warned residents to avoid staying outdoors for long after widespread haze reached the capital on Thursday night.

　　Zhang Lin，a weather forecaster at the Beijing Meteorological Bureau，told China Daily the city will see a bright weekend，with the haze ending on Friday afternoon.

　　China has taken various measures to fight air pollution.Since Jan 1，a total of 74 major cities have been required to issue daily reports on air quality by adopting more extensive monitoring standards，such as the PM 2.5 level.

　　1．What is the main idea of the passage?

　　A．Fog and haze enveloped Shijiazhuang in Hebei on Friday.

　　B．Fog and haze hit central and northern parts of China on Friday.

　　C．Fog and haze caused several accidents in Henan on Friday.

　　D．Fog and haze results from the increasing PM 2.5 density.

　　答案　B　[主旨大意题。本文是资讯类的文章，主旨大意一般在首段。第一段总起报道了雾霾天气笼罩了中国的中部及北部地区。故选B。其他选项都是内容的细节部分，不合适。]

　　2．According to the passage, which city is NOT the four most­polluted city among 120 monitored nationwide?

　　A．Handan.

　　B．Shijiazhuang.

　　C．Zhengzhou.

　　D．Qinhuangdao.

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