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阅读下面材料,在空白处填入适当的内容(不多于3个单词)或括号内单词的正确形式。
Nowadays, many cities are suffering from smog, the short form of smoke and fog. It is especially harmful to children, seniors, pregnant women, smokers and people  【小题1】   lung or heart problems.
An important component (成分) of smog is ground-level ozone (地面臭氧). Actually, ozone that is formed naturally in the atmosphere  【小题2】   (protect) life from the sun’s damaging rays. At ground level, however, ozone hurts people’s eyes, nose, and throat, which can make  【小题3】   more difficult for the body to fight against an  【小题4】   (infect). When the amount of ground-level ozone increases, so does  【小题5】   number of emergency-room visits.
The other component is fine particulate matter (细颗粒物). The  【小题6】   (small) the particle (particulate matter 2.5, PM2.5), the more dangerous it can be. When people take in ozone and particulates from the air, both the blood flow  【小题7】   the oxygen supply to the heart will be reduced.

With such unhealthy air quality, some simple ways are recommended for you 【小题8】   (reduce) higher risk of health problems. On smoggy days, spend less time outdoors. If you have to get outside, close all your windows   【小题9】   you go out. Besides, roll up the windows of 【小题10】   car if you are driving.
答案:【小题1】with
【小题2】protects
【小题3】it。
【小题4】infection。
【小题5】the。
【小题6】smaller。
【小题7】and。
【小题8】to reduce。
【小题9】before。
【小题10】your。
试题分析:本文主要分析雾霾的构成与危害。
【小题1】with。此处是介词with结构,people with lung or heart problems意为“肺部或心脏有问题的人”表示特征等。
【小题2】protects。此处是陈述客观事实,需用一般现在时,填protects。Protect from是一个固定短语,意为使免受…;保护… 。
【小题3】it。此处需要一个代词作形式宾语,指代后面的事情to fight against an infection,填it。
【小题4】infection。根据本空前面的an可知,此处需要填名词infection,表“感染”。臭氧使人们更难抵抗感染。
【小题5】the。此处考查固定表达the number of…,意为“……的数量”。前文的the amount of也是….的数量的意思。
【小题6】smaller。根据后文的the more dangerous可知,此处是“the+比较级,the+比较级”的结构,表“越……,就越……”,故填smaller。
【小题7】and。both…and…为固定表达,意为两者都….,故填and。至心脏的血流及氧气供应都将减少。
【小题8】to reduce。此处需要用动词不定式表示目的,由于是主动含义,故填to reduce。推荐一些简单的减少伤害的方式。
【小题9】before。根据上下文逻辑可知,此处是指“在出门前,要关好所有的窗户”, 故填before。
【小题10】your。此处应填一个物主代词,根据后文的if you are driving可知,此处填形容词性物主代词your。
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