Recent studies have identified four major global environmental risks:【B1】___

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问题    Recent studies have identified four major global environmental risks:【B1】______rain, ozone depletion,【B2】______  and the greenhouse effect. On the whole, thanks to technological changes, people now【B3】______to move toward warmer regions in North America and Europe. Climate warming will probably be a【B4】______to Alaska, which is America’s【B5】______  productive state in Gross National Product (GNP) per square mile.
Studies of the【B6】______of global warming on the United States and other developed regions find that the most vulnerable areas are those【B7】______on undamaged ecosystems -- on naturally【B8】______rainfall, run-off and temperatures, and the extreme of these variables. Agriculture, forestry and coastal activities fall into this category.
  【B9】______. Intensive-care units pf hospitals, communications, heavy manufacturing and microelectronics are among the sectors likely to be unaffected by climate change.  In selecting whether to set up in, say , Hong Kong or in Warsaw, few businesses will consider temperature a weighty factor.
  【B10】______  About 3% of American GNP originates in climate-sensitive sectors such as farming and forestry. Another 10% comes from sectors only modestly sensitive -- energy, water systems, property and construction.【B11】______. [br] 【B7】

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Recent studies have identified four major global environmental risks:【B1】___

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