Read the following passage and mark the letter A, B, C, or D to indicate the answer to each of the question.
Since the early eighties, we have been only too aware of the devastating effects of large-scale environmental pollution. Such pollution is generally the result of poor government planning in many developing nations or the shortsighted, selfish policies of the already industrialized countries, which encourage a minority of the world’s population to squander the majority of its natural resources.
While events such as the deforestation of the Amazon jungle or the nuclear disaster in Chernobyl continue to receive high media exposure, as do acts of environmental sabotage, it must be remembered that not all pollution is on this grand scale. A large proportion of the world's pollution has its source much closer to home. The recent spillage of crude oil from an oil tanker accidentally discharging its cargo straight into Sydney not only caused serious damage to the harbor foreshores but also created severely toxic fumes which hung over the suburbs for days and left the angry residents wondering how such a
disaster could have been allowed to happen.
Avoiding pollution can be a fulltime job. Try not to inhale traffic fumes; keep away from Chemical plants and building-sites; wear a mask when cycling. It is enough to make you want to stay at home. But that, according to a growing body of scientific evidence, would also be a bad idea. Research shows that levels of pollutants such as hazardous gases, particulate matter and other chemical 'nasties’ are usually higher indoors than out, even in the most polluted cities. Since the average American spends 18 hours indoors for every hour outside, it looks as though many environmentalists may be attacking the wrong target.
The word “its” in paragraph 2 refers to _____?
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