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!

A．pollution B．sadness C．illness D．business

A．too B．none C．also D．neither

A．nothing B．everything C．something D．anything

A．as well as B．such as C．instead of D．for example

A．take B．cost C．give D．spend

A．in many ways B．in many things C．in many houses D．by the way

A．and B．but C．or D．until

A．hit B．hurt C．polluted D．destroyed

A．because of B．thanks to C．related to D．or

A．This B．That C．What D．It