GRE写作成为横在中国学生的理想和现实之间的一大障碍，因此，如何攻克写作这道屏障，成为摆在我们面前的首要任务。
Finally, although international drug trafficking provides an economic boon for the rogue nations
supplying the drugs, it carries deleterious economic, social, and public-health consequences
for user nations.
In other cases the economic connection between nations is synergistic--either mutually
beneficial or detrimental. A financial crisis--or a political crisis or natural disaster in one country
can spell trouble for foreign companies, many of which are now multinational in that they rely
on the labor forces, equipment, and raw materials of other nations. And, as trade barriers and
the virtual distance between nations collapse, the result is economic synergies among all
trading nations. For instance, the economic well-being of Middle East nations relies almost
entirely on demand from oil-consuming nations such as the U.S., which depend on a steady
supply from the Middle East.
Nations have also become interconnected in the pursuit of scientific and technological
progress. And while it might be tempting to hasten that the ripples generally benefit other
nations, often one nation's pursuit of progress spells trouble for other nations. For example,
the development of nudear weapons and biological and chemical agents affords the nation
possessing them political and military leverage over other nations. And, global computer
connectivity has served to heighten national-security concerns of all connected nations who
can easily fall prey to Internet espionage.
Finally, the world's nations have become especially interconnected in terms of their public
health. Prior to the modern industrial age, no nation had the capacity to inflict lasting
environmental damage on other nations. But, as that age draws to a close it is evident that
so-called industrial "progress" has carried deleterious environmental consequences worldwide.
Consider, for instance, the depletion of atmospheric ozone, which has warmed the Earth to the
point that it threatens the very survival of the human species. And, we are now learning that
dear-cutting the world's rainforests can set into motion a chain of animal extinction that
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threatens the delicate balance upon which all animals--including humans--depend.
In closing, I take exception to the statement only insofar as a nation can still pursue progress
and the well-being of its own citizens in relative isolation from other nations. And I concede that
in the future the world's nations might respond to the health and security risks of the ripple
effect that I've described by adopting isolationist trade, communications, and military policies.
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