Indoor & Outdoor Air Pollution

Indoor & Outdoor Air Pollution
When people talk about air pollution ,they usually think about smog （烟雾）,acid rain （酸雨） ,and other kinds of outdoor air pollution .But do you know that air pollution also can be inside homes and other buildings.（1 ）
.Scientists have done research on pollution at labs and universities.（2 ）.
Let’s take a closer look at the different types of indoor air pollution .
Many people spend their most time indoors --- as much as 80%∽90% of their live .We work ,study ,eat ,drink and sleep in enclosed （封闭的）environments.For these reasons ,some experts feel that more people suffer from the effects of indoor air pollution than outdoor pollution .
（3 ）Smoking ,cooking ,and smell from building materials ,paints ,furniture ,etc .cause pollution inside buildings .Pollution at home and work is often greater than outdoors .They estimate （估计）that indoor air pollutant levels are 25%∽62% greater than outside levels than outside levels and can cause serious problems
（4 ）We have to reduce the damaging effects of air pollution
（A.We should controll and prevent both indoor and outdoor pollution.
B.Every year ,the indoor air pollution can affect the health of many people.
C.The aims of the research are to find solutions and to educate the public about the problem.
D.There are many reasons for indoor air pollution.）
（）5.The passage tells us that （）
A.air pollution is the most serious pollution .
B.it’s important to prevent air pollution .
C.we can find air pollution everywhere.
D.indoor air pollution is more serious than outdoor air pollution.