题目内容
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 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 2. (protect) life from the sun’s damaging rays. At ground level, however, ozone hurts people’s eyes, nose, and throat, which can make 3. more difficult for the body to fight against an 4. (infect). When the amount of ground-level ozone increases, so does 5. number of emergency-room visits.
The other component is fine particulate matter (细颗粒物). The 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 7. the oxygen supply to the heart will be reduced.?
With such unhealthy air quality, some simple ways are recommended for you 8. (reduce) higher risk of health problems. On smoggy days, spend less time outdoors. If you have to get outside, close all your windows 9. you go out. Besides, roll up the windows of 10. car if you are driving.
1.with
2.protects
3.it。
4.infection。
5.the。
6.smaller。
7.and。
8.to reduce。
9.before。
10.your。
【解析】
试题分析：本文主要分析雾霾的构成与危害。
1. with lung or heart problems意为“肺部或心脏有问题的人”表示特征等。
2. from是一个固定短语，意为使免受…；保护… 。
3. fight against an infection，填it。
4.
5. number of…，意为“……的数量”。前文的the amount of也是….的数量的意思。
6. 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。
7.
8. 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。
9. 故填before。
10. you are driving可知，此处填形容词性物主代词your。
考点;考查说明文阅读
