阅读下面材料，在空白处填入适合的内容（一个单词）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 61 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 62 (protect) life from the sun’s damaging rays. At ground level, however, ozone hurts people’s eyes, nose, and throat, which can make 63 more difficult for the body to fight against an 64 (infect). When the amount of ground-level ozone increases, so does 65 number of emergency-room visits.

　　The other component is fine particulate matter (细颗粒物). The 66 (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 67 the oxygen supply to the heart will be reduced.
 [来源:学*科*网Z*X*X*K]

　　With such unhealthy air quality, some simple ways are recommended for you 68 (reduce) higher risk of health problems. On smoggy days, spend less time outdoors. If you have to get outside, close all your windows 69 you go out. Besides, roll up the windows of 70 car if you are driving.

　　【答案】

　　61. with

　　62. protects

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