When people talk about air pollution, they are usually thinking about outdoor air _______. 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 the illnesses have _______ to do with the polluted indoor air. A lot of pollution comes from indoor activities _______ smoking and cooking. As most people _______ about 80%—90% of their time inside buildings, it is important to take indoor air pollution seriously, too. Air pollution influences our health _______. When the air is polluted, not only young children and old people _______ from it, _______ people without health problems suffer as well. Indoor air pollution can _______ people’s eyes, noses and throats. Air pollution, both indoor and outdoor, can also _______ to lung cancer and heart disease! In the Great London Fog in 1952, 4000 people died in a few days ________ the pollution! It is said that half a million young children and women die each year in India because of indoor air pollution!
16. | A．pollution | B．pollute | C．polluting |
17. | A．nothing | B．everything | C．something |
18. | A．as well as | B．such as | C．instead of |
19. 20. | A．in many ways | B．in many things | C．in many houses |
21. 22. 23. 24. 25. | A．because of | B．thanks to | C．related to |
