Air Pollution

　　1 Particle (微粒) pollution is one type of pollution that affects air quality. It is caused by tiny particles thrown into the air by factories and other sources. “Though small, the particles can get deep into your lungs and even affect your heart,” said an expert Alison Davis.

　　2 Air pollution from particles and other sources like ozone (臭氧) can also hurt trees and animals. Ozone is created when pollution from places like factories combines with sunlight. “Ozone can make asthma (哮喘) and lung problems worse,” said another expert Kerry Shearer.

　　3 The summer usually has the worst air quality, because there is more sunlight. Sunlight reacts with pollutants to create ozone. Ozone is helpful high in the atmosphere, because it helps block the sun’s harmful rays. But down closer to the earth, ozone can be harmful to people. But that doesn’t mean that you should be afraid to stay outside.

　　4 Davis suggests that you check the Air Quality Index (指數(shù)). The Air Quality Index works like a weather forecast. It shows how healthy the air you breathe is that day. The index gives a color to each day. Green means that the air is healthy and clean. Yellow means that people with asthma should be a little more careful than usual. “If it’s a code red day, then you shouldn’t play as hard,” Davis said.

　　5 Some measures can be taken to make a big difference. “Pollution ties in with energy conservation and shutting off lights,” Shearer said, adding that kids can encourage their parents to carpool (合伙使用汽車(chē)). Davis says that recycling can help, because it saves energy, which means that factories and power plants don’t have to create as much pollution. So next time you go outside to play, think about steps you can take to make the air healthier and the sky bluer!

　　1 Paragraph 2

　　2 Paragraph 3

　　3 Paragraph 4

　　4 Paragraph 5

　　A.Ozone brings threats to human health

　　B. Everyone should carpool

　　C. Sunlight boosts the threat

　　D. Air Quality Index is a new weather forecast

　　E. Measures should be taken to stop pollution

　　F. Air Quality Index helps to make arrangements

　　正確答案:ACFE

　　5 Particle pollution

　　6 Ozone

　　7 Sunlight

　　8 The Air Quality Index

　　A.reacts with pollutants to create ozone

　　B. is helpful high in the atmosphere

　　C. has different levels including green, yellow and red

　　D. can prevent air pollution

　　E. exists in the atmosphere only

　　F. is caused by tiny particles thrown into the air by factories and other source

　　正確答案:FBAC

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