题目
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 pro
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 pro
提问时间：2021-01-27
答案
根据上下文我们可以得出答案BCDA,根据文章的题目提示和各段落的中心思想可知第五题选B
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