22. The conclusion in this argument is that increased vigilance by drug enforcement
authorities has resulted in an increase in the illegal use of cocaine. The author reaches
this conclusion on the grounds that drug traffickers have responded to increased
enforcement efforts by switching from bulkier and riskier drugs to cocaine. Presumably,
the authors reasoning is that the increased enforcement efforts inadvertently brought
about an increase in the supply of cocaine which, in turn, brought about the observed
increase in the illegal use of cocaine. This line of reasoning is problematic in two
important respects.
In the first place, the author has engaged in after this, therefore because of this
reasoning. The only reason offered for believing that the increased vigilance caused the
increase in cocaine use is the fact that the former preceded the latter. No additional
evidence linking the two events is offered in the argument, thus leaving open the
possibility that the two events are not causally related but merely correlated. This in turn
leaves open the possibility that factors other than the one cited are responsible for the
increase in cocaine use.
In the second place, the author assumes that an increase in the supply of cocaine is
sufficient to bring about an increase in its use. While this is a tempting assumption, it is
a problematic one. The presumption required to substantiate this view is that drug users
are not particular about which drugs they use, so that if marijuana and heroin are not
available, they will switch to whatever drug is available―cocaine in this case. The
assumption does not seem reasonable on its face. Marijuana, heroin, and cocaine are not
alike in their effects on users; nor are they alike in the manner in which they are
ingested or in their addictive properties. The view that drug users choice of drugs is
simply a function of supply overlooks these important differences.
In conclusion, the author has failed to establish a causal link between increased
enforcement efforts and the observed increase in illegal cocaine use. While the
enforcement activities may have been a contributing factor, to show a clear causal
connection the author must examine and rule out various other factors.
GRE词汇:D开头
GRE词汇:乐曲类
新GRE填空技巧
GRE词汇天天记:认同类
GRE词汇天天记:法律类
GRE词汇:衔接词
GRE词汇:F开头
GRE词汇:吃喝类
GRE词汇:填空词汇2014
GRE词汇:证明类
GRE高频词汇
GRE词汇:多义词
GRE词汇量要求
GRE作文中的衔接词
GRE词汇C字头的单词多义词辨析
GRE写作常用词汇
GRE词汇:音乐类
GRE词汇:税费类(2)
GRE词汇:格言类
GRE词汇天天记:服务类
GRE词汇:A开头
GRE词汇:J-M 开头
GRE词汇:田园类
GRE词汇天天记:回忆类
GRE词汇:B开头
GRE词汇:新旧类
新GRE高频词汇
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GRE词汇:房屋类
GRE写作中的法律词汇
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