GMAT考试Testprep数学精解_GMAT数学

GMAT考试Testprep数学精解

　　Premises

　　Once youve found the conclusion， most often everything else in the argument　will be either premises or noise. The premises provide evidence for the conclusion; they form the foundation or infrastructure upon which the conclusion depends. To determine whether a statement is a premise， ask yourself whether it supports the conclusion. If so， its a premise. Earlier we saw that　writers use certain words to flag conclusions; likewise writers use certain　words to flag premises. Following is a partial list of the most common premise indicators：

　　Premise Indicators

　　because for

　　since is evidence that

　　if in that

　　as owing to

　　suppose inasmuch as

　　assume may be derived from

　　Example：

　　Since the incumbents views are out of step with public opinion， he probably　will not be reelected.

　　Here since is used to flag the premise that the incumbents positions are　unpopular.

　　Suppressed Premises

　　Most arguments depend on one or more unstated premises. Sometimes this indicates a weakness in the argument， an oversight by the writer. More often， however， certain premises are left tacit because they are too numerous， or the　writer assumes that his audience is aware of the assumptions， or he wants the audience to fill in the premise themselves and therefore be more likely to　believe the conclusion.