When people talk about air pollution, they are usually thinking about outdoor air 1 . But do you know that there is 2 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 3 to do with polluted indoor air. A lot of pollution comes from indoor activities 4 smoking and cooking. As most people 5 about 80-90% of their time inside buildings, it is important to take indoor air pollution seriously, too. Air pollution influences our health 6 . When the air is polluted, not only young children and old people suffer from it, 7 people with health problems suffer as well. Indoor air pollution can 8 people's eyes, noses and throats. Air pollution, both indoor and outdoor, can also lead to lung cancer（肺癌）and heart disease! In the great London fog in 1952, 4,000 people died in a few days 9 the pollution! 10 is said that half a million young children and women die each year in India because of indoor air pollution! 小题1: A．pollution B．sadness C．illness D．business 小题2: A．too B．none C．also D．neither 小题3: A．nothing B．everything C．something D．anything 小题4: A．as well as B．such as C．instead of D．for example 小题5: A．take B．cost C．give D．spend 小题6: A．in many ways B．in many things C．in many houses D．by the way 小题7: A．and B．but C．or D．until 小题8: A．hit B．hurt C．polluted D．destroyed 小题9: A．because of B．thanks to C．related to D．or 小题10: A．This B．That C．What D．It