GMAT考试AWA作文-牛牛整理的作文常用句型

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CR句子（蓝字部分是可以直接套用的）
                 
时地全等:
1.      The argument is based on the current situation, but present conditions need not continue in the future if they can be improved. What if oil tankers can be redesigned so that they pose less risk of an oil spill? In that case, the argument is weakened because…

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忽略他因:
2.      A conclusion may be weakened when another explanation at least as compelling as the original is offered. Coffee consumption may have decreased over the decade for some reason other than consumers’ awareness of the adverse health effects of caffeine. If the price of coffee has increased in the same period that consumption has decreased, then the decrease may well be the result of consumers’ attention to price rather than their attention to health. Higher prices would offer a good alternative explantion that would weaken the original explanation.

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3.      If a factor other than the economy could account for the differences in agricultural production, then the argument is weakened. If the two countries grow different kinds of crops that may react differently to the same climatic conditions, then the types of crops, rather than economy, could be responsible for the differences in production.

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4.      The argument directly attributes increased productivity to the existence of PRP contracts. Any information that other factors might have contributed to the increase in productivity would weaken the argument.
   If production equipment was modernized during the same period that the new contracts took effect, then it is possible that the modernized equipment was responsible for the higher level of productivity.

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5.      The journalists assumes that the researchers’ lack of access to the accelerators is responsible for the decline in the number of articles. What else could explain fewer articles? What if the decline is due, not to the availability of the accelerators for experiments, but to policies regarding publishing articles related to such experiments? An alternate explanation is that changes in the editorial policies of physics journals, rather than the effect of the out-of-service accelerators, could well re responsible for the lower number of published articles about particle-accelerator research.

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错误类比:
6.      Since the company reporting the greater number of job-related accidents also considers more types of accidents to be job-related, the basis of the comparison is weakened and so is the argument.

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无理假设:
7.      The argument assumes that any problem with a product would cause a bottleneck or a delay in production. It is entirely possible that there might be flaws that might not cause such problems; thus the assumption is questionable.
8.      The conclusion relies upon the supposition that lawyers who currently advertise charge the consumer less than other lawyers for the same legal services. What if this does not continue to hold true? If more lawyers begin to advertise, they may not charge any less for their services than they did previously, and they are, given the supposition, likely to be more expensive than those who currently advertise. In this case, increasing the number of lawyers who advertise would not lower overall consumer legal costs.

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9.      What assumption does Sharon make in putting together her argument? Sharon
   makes an equalizing statement about people and their acquaintance when she points that, if an average person knows 50 workers, at least one of them is likely to be unemployed. Sharon’s generalization must assume that this is the case equally throughout the country and that unemployment is not concentrated in some geographically isolated areas.

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样本不足:
10.  The conclusion is based on an upward trend that is derived from data for two years. Data from only two years provide rather weak evidence of a trend. Additional evidence that provides a context for the annual inflation rates during the most recent two-year period will promote a more solid evaluation of this prediction of next year’s inflation rate.
   If inflation has recently been stable at 4 percent, and the temporary drop the previous year is accounted for by lower oil prices, then the basis for the prediction seems quite weak.

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11.  The argument is weak because it makes a generalization on the basis of only one example. Any example of a volcanic eruption that was not followed by a cooling of the asmosphere weakens this argument. The example of the eruption of El in 1982, which resulted in higher than normal air temperatures, contradicts the generalization of cooler temperatures following volcanic eruptions.