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When people talk about air pollution, they are usually thinking about outdoor air   46  . But do you know that there is also air pollution inside homes, offices, hotels and other buildings? The air in your home can be 2 to 100 times more polluted than the air outdoors! In fact, some American doctors say that 50% of illnesses have   47   to do with polluted indoor air.

A lot of pollution comes from indoor activities   48   smoking and cooking. As most people  49   about 80%-90% of their time inside buildings, it is important to take indoor air pollution seriously, too.

Air pollution influences our health 50  . When the air is polluted, not only young children and old people  51   from it,  52   people with health problems suffer as well. Indoor air pollution can   53   people’s eyes, noses and throats. Air pollution, both indoor and outdoor, can also  54 lung cancer and heart disease! In the great London fog in 1952, 4, 000 people died in a few days  55   the pollution! It is said that half a million young children and women die each year in India because of indoor air pollution!

(   )46.A.pollution               B.pollute                       C.polluted

(   47.A.nothing                 B.everything                 C.something         

(   48.A.as well as              B.such as                            C.instead of          

(  )49.A.take                B.cost                          C.spend                

(   50.A.in many ways        B.in many things           C.in many houses  

(   51.A.bear                      B.stand                         C.suffer

(   )52.A.and                      B.but                            C.or                     

(   )53.A.hit                       B.hurt                          C.pollute               

(   )54.A.cause                   B.get                            C.give                         

(   )55.A.because of           B.thanks to                   C.because

46.A 47. C48.B 49.C50.A51.C52.B53.B 54.A55.A

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