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完形填空
Cloze 1
Haze(雾霾) has been a big problem in many cities in China.
Last December, students in Beijing had a special 1._____ of six
days. Kindergarten, primary and middle school students 2._____
at home on the Internet only because of the haze. It was one of
the decisions that the government made during the days under
the red alert(警报 ). China set a four-tier haze alert system in
2013. And on December 8, 2015, Beijing sent out its first red
alert ever. During the next few weeks, blue, yellow and orange
alerts came several 3._____ In northeastern China, things were
even 4._____. The PM2.5 level 5._____ over 1,000 in Shenyang
on November 8.
What causes the haze and what should we do to beat it?
According to some TV reports, 6._____too much coal and oil
produces more harmful gases and particles(颗粒) in the air. They
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are the main cause of PM 2.5 and haze in China, and measures
have been taken to deal 7._____ the haze. For example, the
Beijing government has 8._____ set a limit on car