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  3. The problem of acid rain originated with the Industrial Revolution, and it has been growing ever since. The more accurate scie

The problem of acid rain originated with the Industrial Revolution, and it has been growing ever since. The more accurate scie

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问题     The problem of acid rain originated with the Industrial
Revolution, and it has been growing ever since. The more
accurate scientific term of " acid rain" would be " acid
deposition". The dry form of such deposition is just damaging【M1】______
to the environment as the liquid form. The severity of its effects
has long been recognized in local settings, exemplified by the【M2】______
spells of acid smog in heavy industrialized areas. The widespread【M3】______
destructiveness of acid rain, moreover, has become evident only【M4】______
in recent decades. One large area has been studied extensively【M5】______
is northern Europe, where acid rain has eroded structures, injured
crops and forests, and threatened life in freshwater lakes. In 1984,
for example, environmental reports indicated that almost half of
the trees in Germany’s Black Forest has been damaged by acid【M6】______
rain. The northeastern United States and eastern Canada have
also been particularly effected by this form of pollution; damage【M7】______
has also been detected in other areas of these countries and
other regions of the world.
    Industrial emissions have been blamed as the major cause
of acid rain. Because the chemical reactions involved in the
production of acid rain in atmosphere are complex and as yet【M8】______
little understood, industries have tended to challenge such
assessments and to stress the need of further studies; and【M9】______
because of the cost of pollution reduction, governments have
tended to support this attitude.
    Studies released by the US government in the early 1980,【M10】______
however, strongly indicated industries as the main source of
acid rain, in the eastern US and Canada.
【M3】
选项
答案heavy→heavily
解析 词汇错误。heavy是形容词，不能修饰形容词industrialized，而heavily是heavy的副词形式，可修饰形容词，意为“高度工业化的”。
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