[填空题]

Air pollution exists not only outdoor, but also indoor. It has great effects on people, and there are many measures taken to correct the problem.
Ⅰ. Effects of air pollution
1) Different groups of individuals are affected by air pollution in different ways.
Some individuals are more (1) ______ to pollutants.
-- Young children and elderly people suffer more.
-- People with (2) ______ suffer more.
2) The extent of air pollution effects on individuals depends on (3) ______ to the damaging chemicals.
3) Short-term effects
-- (4) to the eyes, nose and throat
-- upper respiratory infections
-- headaches, nausea, and allergic reactions
4) Long-term effects
-- chronic respiratory disease
-- lung cancer
-- heart disease