GMAT考试写作指导：Argument范文八三

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7.  In this argument the author concludes that people trying to lose weight are better
" W/ y3 ~& m" ^2 eoff consuming sugar than the artificial sweetener aspartame. To support this conclusion
the author argues that aspartame can cause weight gain by triggering food cravings,
( K; j) r) j0 e. Awhereas sugar actually enhances the body's ability to bum fat. Neither of these reasons
provides sufficient support for the conclusion.
      The first reason that aspartame encourages food cravings is supported by research
, l' |& v" _  r$ t# k. f2 p) T' lfindings that high level s of aspartame deplete the brain chemical responsible for
registering a sense of being sated, or full. But the author's generalization based on this
% J! I" G0 T* H* }$ J) gresearch is unreliable. The research was based on a sample in which large amounts of
aspartame were istered; however, the author applies the research findings to s
; l% f; Z. g" R2 `( ?2 htarget population that includes all aspartame users, many of whom would probably not
consume high levels of the artificial sweetener.
) ]4 q, B; K; p$ @( @      The second reason that sugar enhances the body's ability to bum fat is based on
1 Q! t& V, C  T. }( X# othe studies in which experimental groups, whose members consumed sugar after at least
0 |, d7 q# ~3 f45 minutes of continuous exercise, showed increased rates of fat burning. The author's
2 t4 }% w8 u- ?3 l3 Kgeneral claim, however, applies to all dieters who use sugar instead of aspartame, not
+ w8 E% N! y7 f) b" M8 u- y  wjust to those who use sugar after long periods of exercise. Once again, the author's
2 q& i! l& L) |/ V2 X$ a& ], E: ]generalization is unreliable because it is based on a sample that clearly does not
1 t: L8 o  M* x2 Z8 a& lrepresent all dieters.
' C* z; Z' t  S' G: O      To conclude, each of the studies cited by the author bases its findings on evidence
that does not represent dieters in general; for this reason, neither premise of this
argument is a reliable generalization. Consequently, I am not convinced that dieters are
3 l  t' Z, S9 Q4 ^) cbetter off consuming sugar instead of aspartame.